net-bgpvpn : fix access to rc files
net-bgpvpn : fix access to rc files

The BASE variable does not seem to exist at the time the yaml
file is compiled. We should use the full path to access our
rc files.

Change-Id: I13dca25ea0f6adbd8eaa69f6447ae3ef5320def6
Closes-bug: #1561206

dongwenjuan/project-config,Tesora/tesora-project-config,openstack-infra/project-config,Tesora/tesora-project-config,openstack-infra/project-config,dongwenjuan/project-config