virt-install: Add convenience option '--controller usb2'

This sets up a USB2 controller with fallback USB1 support.

Author: crobinso

man/en/virt-install.pod.in

@@ -846,6 +846,9 @@ Force disable ACPI for the guest.
 Attach a controller device to the guest. TYPE is one of:
 B<ide>, B<fdc>, B<scsi>, B<sata>, B<virtio-serial>, or B<usb>.
 
+Controller also supports the special value B<usb2>, which will set up
+a USB2 controller with fallback USB1 support.
+
 =over 4
 
 =item B<model>

tests/clitest.py

@@ -676,6 +676,7 @@ def default_args(app, cli, testtype):
         "--controller usb,model=ich9-ehci1,address=0:0:4.7",
         "--controller usb,model=ich9-ehci1,address=0:0:4.7,index=0",
         "--controller usb,model=ich9-ehci1,address=0:0:4.7,index=1,master=0",
+        "--controller usb2",
       ],
 
       "invalid": [

virtinst/cli.py

@@ -1749,6 +1749,10 @@ def parse_controller(guest, optstring, dev=None):
     if optstring is None:
         return None
 
+    if optstring == "usb2":
+        guest.add_usb_ich9_controllers()
+        return None
+
     # Peel the mode off the front
     opts = parse_optstr(optstring, remove_first="type")
     ctrltype = get_opt_param(opts, "type")