Ignore chown error in openstack node, as contrail user will not be present.
Ignore chown error in openstack node, as contrail user
will not be present.

Change-Id: Ibcd2b009cd4c3759a681a31915192f687797a423
Closes-Bug: 1612826

Juniper/contrail-fabric-utils,Juniper/contrail-fabric-utils