Allowed address pair mac-address

When allowed address pair mac is not specified, it is defaulted to VMI mac. But
it is set as array of string instead of string.

Fix to set it as string iso array

Change-Id: I4d837bd9c2988bcb286af45a3eec032bdf56038d
Closes-bug: #1545824
(cherry picked from commit cf78047)

src/config/api-server/vnc_cfg_types.py

@@ -396,7 +396,7 @@ def http_post_collection(cls, tenant_name, obj_dict, db_conn):
                 aaps = aap_config['allowed_address_pair']
                 for aap in aaps or []:
                     if aap['mac'] == "":
-                        aap['mac'] = obj_dict['virtual_machine_interface_mac_addresses']['mac_address']
+                        aap['mac'] = obj_dict['virtual_machine_interface_mac_addresses']['mac_address'][0]
         return True, ""
     # end http_post_collection
 
@@ -413,7 +413,7 @@ def http_put(cls, id, fq_name, obj_dict, db_conn):
                 aaps = aap_config['allowed_address_pair']
                 for aap in aaps or []:
                     if aap['mac'] == "":
-                        aap['mac'] = read_result['virtual_machine_interface_mac_addresses']['mac_address']
+                        aap['mac'] = read_result['virtual_machine_interface_mac_addresses']['mac_address'][0]
         return True, ""
     # end http_put
 # end class VirtualMachineInterfaceServer