InterfaceManagerConfigurationTest vlanInterfaceTests sleep 2s -> 4s
to unblock a problem hit by Anil Belur on autorelease
It works with 2s locally, but may be slower on buid VMs.
PS: This is a quick fix / hack / workaround; of course, the real long
term solution is to find ways to not need Thread.sleep() at all .. I'd
like like to complete earlier work in this regard, but haven't gotten to
it yet.
Change-Id: I01e0380952ba8c3ee906fae5469dc1b2970d0185
Signed-off-by: Michael Vorburger <vorburger@redhat.com>