Summary: Updated Ethernet regex for vlan-tagged "p1p1.2" style interfaces

Detail: Checks for other Ethernet interface names uses startsWith(),
whereas the p1p1 style interface uses a regex that doesn't allow for
tailing characters, and so blocks vlan IDs. Fixed.

BUG-ID: CLOUDSTACK-4884
Bugfix-for: 4.2.1
Reviewed-by:
Reported-by:
Signed-off-by: John Kinsella <jlk@stratosec.co> 1381965250 -0700