Comment 7 for bug 1768729

Reviewed: https://review.opencontrail.org/42724
Committed: http://github.com/Juniper/contrail-test/commit/6feb4a082fb1cf191f64720caaf003281a3a94e1
Submitter: Zuul v3 CI (<email address hidden>)
Branch: master

commit 6feb4a082fb1cf191f64720caaf003281a3a94e1
Author: Mallam Chandra Sekhar Reddy <email address hidden>
Date: Thu May 3 14:38:24 2018 +0530

Adding extra check before pinging sub-interfaces

Adding extra check to verify whether vlan sub-interfaces are
created properly or not before pinging vlan sub interfaces.

Also, enabling single isid test as sanity instead of vlan
sub interfaces isid test

Change-Id: Id6cc49b07dfa418ec72f8af58fc029ddd23dd8cc
Closes-Bug: #1768729