clone: Drop net <target> for new guest

Since a hardcoded net target can prevent 2 guests from starting
simultaneously, seems like the type of thing to drop.

Author: crobinso

tests/cli-test-xml/compare/clone-auto1.xml

@@ -48,12 +48,10 @@
     <interface type="network">
       <mac address="00:11:22:33:44:55"/>
       <source network="default"/>
-      <target dev="testnet0"/>
       <model type="e1000"/>
     </interface>
     <interface type="user">
       <mac address="00:11:22:33:44:55"/>
-      <target dev="testnet1"/>
     </interface>
     <parallel type="file">
       <source path="/tmp/foo.log"/>

tests/cli-test-xml/compare/clone-auto2.xml

@@ -27,7 +27,6 @@
     <controller type="ide" index="0"/>
     <interface type="user">
       <mac address="00:11:22:33:44:55"/>
-      <target dev="testnet0"/>
     </interface>
     <parallel type="file">
       <source path="/tmp/foo.log"/>

tests/clone-xml/general-cfg-in.xml

@@ -28,10 +28,12 @@
     <interface type='network'>
       <mac address='52:54:00:6c:a0:cb'/>
       <source network='test1'/>
+      <target dev='vnet0'/>
     </interface>
-    <interface type='network'>
+    <interface type='bridge'>
       <mac address='52:54:00:6c:bb:ca'/>
-      <source network='test2'/>
+      <source bridge='br0'/>
+      <target dev='my_manual_dev'/>
     </interface>
     <input type='mouse' bus='ps2'/>
     <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'/>

tests/clone-xml/general-cfg-out.xml

@@ -29,9 +29,9 @@
       <mac address="01:23:45:67:89:00"/>
       <source network="test1"/>
     </interface>
-    <interface type="network">
+    <interface type="bridge">
       <mac address="01:23:45:67:89:01"/>
-      <source network="test2"/>
+      <source bridge="br0"/>
     </interface>
     <input type="mouse" bus="ps2"/>
     <graphics type="vnc" port="-1" autoport="yes" listen="127.0.0.1"/>

virtinst/CloneManager.py

@@ -447,6 +447,8 @@ def setup_clone(self):
         self._guest.uuid = self._clone_uuid
         self._clone_mac.reverse()
         for iface in self._guest.get_devices("interface"):
+            iface.target_dev = None
+
             if self._clone_mac:
                 mac = self._clone_mac.pop()
             else: