Allow install os-vif library used by Nova

In future Nova will use os-vif library for some communication with Neutron.
This patch add ability to install os-vif library that requires for run
tempest-jobs for new patches, that used os-vif.

Change-Id: I28e48afd3c740b1aa50c994d99f660f095e7deda
diff --git a/stackrc b/stackrc
index 74d507c..9bd132a 100644
--- a/stackrc
+++ b/stackrc
@@ -477,6 +477,10 @@
 GITREPO["os-brick"]=${OS_BRICK_REPO:-${GIT_BASE}/openstack/os-brick.git}
 GITBRANCH["os-brick"]=${OS_BRICK_BRANCH:-master}
 
+# os-vif library to communicate between Neutron to Nova
+GITREPO["os-vif"]=${OS_VIF_REPO:-${GIT_BASE}/openstack/os-vif.git}
+GITBRANCH["os-vif"]=${OS_VIF_BRANCH:-master}
+
 # ironic common lib
 GITREPO["ironic-lib"]=${IRONIC_LIB_REPO:-${GIT_BASE}/openstack/ironic-lib.git}
 GITBRANCH["ironic-lib"]=${IRONIC_LIB_BRANCH:-master}