Adjust VNI column for provisioner to text

Allows the storing of the textual cluster labels (e.g. 'upstream') as
valid VNI values in the template.

api-daemon/pvcapid/provisioner.py

@@ -268,7 +268,7 @@ def create_template_network_element(name, vni):
         networks = []
     found_vni = False
     for network in networks:
-        if int(network['vni']) == int(vni):
+        if network['vni'] == vni:
             found_vni = True
     if found_vni:
         retmsg = {'message': 'The VNI "{}" in network template "{}" already exists.'.format(vni, name)}