Added Cisco-IOS-XE-17.18.1 Release Yang Models (#1665)

Co-authored-by: Apoorva Natraj Shastry <apshastr+cisco@cisco.com>

Author: apoorvashastry

vendor/cisco/xe/17181/BIC/Cisco-IOS-XE-aaa.md

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+## Cisco-IOS-XE-aaa.yang
+
+
+- [XPaths Obsoleted](#xpaths-obsoleted)
+- [XPaths Deprecated](#xpaths-deprecated)
+- [XPaths Modified](#xpaths-modified)
+- [XPaths Added](#xpaths-added)
+
+## XPaths Obsoleted
+
+### Description
+
+## XPaths Deprecated
+
+### Description
+
+## XPaths Modified
+
+- native/aaa/server/radius/dynamic-author/client/vrf
+
+### Description
+
+A new when expression added.
+
+## XPaths Added
+
+### Description

vendor/cisco/xe/17181/BIC/Cisco-IOS-XE-ctrl-mng-cfg.md

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+## Cisco-IOS-XE-ctrl-mng-cfg.yang
+
+
+- [XPaths Obsoleted](#xpaths-obsoleted)
+- [XPaths Deprecated](#xpaths-deprecated)
+- [XPaths Modified](#xpaths-modified)
+- [XPaths Added](#xpaths-added)
+
+## XPaths Obsoleted
+
+### Description
+
+## XPaths Deprecated
+
+### Description
+
+## XPaths Modified
+
+- ctrl-mng-if(grouping)/name
+
+### Description
+
+Pattern expression may be more constrained than before
+
+## XPaths Added
+
+### Description

vendor/cisco/xe/17181/BIC/Cisco-IOS-XE-device-tracking.md

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+## Cisco-IOS-XE-device-tracking.yang
+
+
+- [XPaths Obsoleted](#xpaths-obsoleted)
+- [XPaths Deprecated](#xpaths-deprecated)
+- [XPaths Modified](#xpaths-modified)
+- [XPaths Added](#xpaths-added)
+
+## XPaths Obsoleted
+
+### Description
+
+## XPaths Deprecated
+
+### Description
+
+## XPaths Modified
+
+- native/device-tracking/policy/limit/address-count-config
+
+### Description
+
+The mandatory node address-count-config is added
+
+## XPaths Added
+
+### Description

vendor/cisco/xe/17181/BIC/Cisco-IOS-XE-hsrp.md

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+## Cisco-IOS-XE-hsrp.yang
+
+
+- [XPaths Obsoleted](#xpaths-obsoleted)
+- [XPaths Deprecated](#xpaths-deprecated)
+- [XPaths Modified](#xpaths-modified)
+- [XPaths Added](#xpaths-added)
+
+## XPaths Obsoleted
+
+### Description
+
+## XPaths Deprecated
+
+### Description
+
+## XPaths Modified
+
+- config-interface-hsrp-grouping(grouping)/standby/standby-list/track/decrement
+
+### Description
+
+The default '10',is removed.
+
+## XPaths Added
+
+### Description

vendor/cisco/xe/17181/BIC/Cisco-IOS-XE-igmp.md

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+## Cisco-IOS-XE-igmp.yang
+
+
+- [XPaths Obsoleted](#xpaths-obsoleted)
+- [XPaths Deprecated](#xpaths-deprecated)
+- [XPaths Modified](#xpaths-modified)
+- [XPaths Added](#xpaths-added)
+
+## XPaths Obsoleted
+i
+
+- native/ip/igmp/snooping
+- native/ip/igmp/snooping/check
+- native/ip/igmp/snooping/check/rtr-alert-option
+- native/ip/igmp/snooping/check/ttl
+- native/ip/igmp/snooping/explicit-tracking
+- native/ip/igmp/snooping/explicit-tracking/limit
+- native/ip/igmp/snooping/l2-entry-limit
+- native/ip/igmp/snooping/last-member-query-count
+- native/ip/igmp/snooping/last-member-query-interval
+- native/ip/igmp/snooping/querier-conf
+- native/ip/igmp/snooping/querier-conf/querier
+- native/ip/igmp/snooping/querier-entry
+- native/ip/igmp/snooping/querier-entry/address
+- native/ip/igmp/snooping/querier-entry/max-response-time
+- native/ip/igmp/snooping/querier-entry/query-interval
+- native/ip/igmp/snooping/querier-entry/tcn
+- native/ip/igmp/snooping/querier-entry/tcn/query
+- native/ip/igmp/snooping/querier-entry/tcn/query/count
+- native/ip/igmp/snooping/querier-entry/tcn/query/interval
+- native/ip/igmp/snooping/querier-entry/timer
+- native/ip/igmp/snooping/querier-entry/timer/expiry
+- native/ip/igmp/snooping/querier-entry/version
+- native/ip/igmp/snooping/report-suppression
+- native/ip/igmp/snooping/robustness-variable
+- native/ip/igmp/snooping/tcn
+- native/ip/igmp/snooping/tcn/flood
+- native/ip/igmp/snooping/tcn/flood/query
+- native/ip/igmp/snooping/tcn/flood/query/count
+- native/ip/igmp/snooping/tcn/query
+- native/ip/igmp/snooping/tcn/query/solicit
+
+### Description
+xpaths deprecated from status 'current.
+
+## XPaths Deprecated
+
+### Description
+
+## XPaths Modified
+
+### Description
+
+## XPaths Added
+
+### Description

vendor/cisco/xe/17181/BIC/Cisco-IOS-XE-install-rpc.md

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+## Cisco-IOS-XE-install-rpc.yang
+
+
+- [XPaths Obsoleted](#xpaths-obsoleted)
+- [XPaths Deprecated](#xpaths-deprecated)
+- [XPaths Modified](#xpaths-modified)
+- [XPaths Added](#xpaths-added)
+
+## XPaths Obsoleted
+
+- install(rpc)/input(input)/reloadfast
+
+### Description
+
+The status changed from deprecated to obsolete
+
+## XPaths Deprecated
+
+### Description
+
+## XPaths Modified
+
+### Description
+
+## XPaths Added
+
+### Description

vendor/cisco/xe/17181/BIC/Cisco-IOS-XE-interfaces.md

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+## Cisco-IOS-XE-isis.yang
+
+
+- [XPaths Obsoleted](#xpaths-obsoleted)
+- [XPaths Deprecated](#xpaths-deprecated)
+- [XPaths Modified](#xpaths-modified)
+- [XPaths Added](#xpaths-added)
+
+## XPaths Obsoleted
+
+### Description
+
+## XPaths Deprecated
+
+### Description
+
+## XPaths Modified
+
+- native/interface/AppGigabitEthernet/ipv6/router/isis
+- native/interface/BD-VIF/ipv6/router/isis
+- native/interface/BDI/ipv6/router/isis
+- native/interface/Ethernet/ipv6/router/isis
+- native/interface/FastEthernet/ipv6/router/isis
+- native/interface/FiveGigabitEthernet/ipv6/router/isis
+- native/interface/FortyGigabitEthernet/ipv6/router/isis
+- native/interface/GigabitEthernet/ipv6/router/isis
+- native/interface/HundredGigE/ipv6/router/isis
+- native/interface/LISP/ipv6/router/isis
+- native/interface/Loopback/ipv6/router/isis
+- native/interface/Port-channel/ipv6/router/isis
+- native/interface/Port-channel-subinterface/Port-channel/ipv6/router/isis
+- native/interface/TenGigabitEthernet/ipv6/router/isis
+- native/interface/Tunnel/ipv6/router/isis
+- native/interface/TwentyFiveGigE/ipv6/router/isis
+- native/interface/TwoGigabitEthernet/ipv6/router/isis
+- native/interface/Virtual-Template/ipv6/router/isis
+- native/interface/Vlan/ipv6/router/isis
+
+### Description
+
+Must expression more constrained than before
+
+## XPaths Added
+
+### Description

vendor/cisco/xe/17181/BIC/Cisco-IOS-XE-isis.md

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+## Cisco-IOS-XE-l2vpn.yang
+
+
+- [XPaths Obsoleted](#xpaths-obsoleted)
+- [XPaths Deprecated](#xpaths-deprecated)
+- [XPaths Modified](#xpaths-modified)
+- [XPaths Added](#xpaths-added)
+
+## XPaths Obsoleted
+
+### Description
+
+## XPaths Deprecated
+
+### Description
+
+## XPaths Modified
+
+- native/interface/Loopback/xconnect
+
+### Description
+
+The if-feature 'ios-features:serial-pseudowire' is added in container xconnect
+
+## XPaths Added
+
+### Description