engine: remove "Red Hat" from description of VmInterfaceType enum values

Red Hat" notion should be removed from the GUI's VmInterfaceType translated
values (Enums.properties) and from the enum's description which is used
for audit logs.

Change-Id: I7ce496c3afb9ecb95795d2edbb029316fa8a5c37
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>