Remove dependency on contrail-vrouter-init package
in case of OpenContrail.
Following changes are done (along with changes in
contrail-packages repo).
This commit makes sure that vrouter upstart file which
uses contrail-vrouter-init scripts is reinstated when
building Juniper contrail package.

Otherwise if one is building for OpenContrail, vrouter
upstart file will not include scripts from
contrail-vrouter-init package.

Closes-PR: 1383561
Change-Id: I4ab9c0d1f15088e8e184e0eec88d6235ddca34e3