Do not try to reserve the address if it is same as gateway ip. Gatewa…

…y ip is already reserved at the time of subnet creation.

Change-Id: Id763db6d20620dd820443ffb619c0fb66c0b8190
Closes-Bug: 1372384
(cherry picked from commit aad6d3e)

src/config/api-server/vnc_addr_mgmt.py

@@ -745,6 +745,8 @@ def ip_alloc_req(self, vn_fq_name, sub=None, asked_ip_addr=None):
                                     addr_from_start = subnet_dict['addr_start'])
                 self._subnet_objs[vn_fq_name_str][subnet_name] = subnet_obj
 
+            if asked_ip_addr == str(subnet_obj.gw_ip):
+                return asked_ip_addr
             if asked_ip_addr and not subnet_obj.ip_belongs(asked_ip_addr):
                 continue
             try: