Adding running checks for neutron.client

The patch adds waiter check for neutron.client in order
to be sure that neutron services are up and running before
execute neutron.client state.

Change-Id: I858c30b2dad81f6b5ee42bda9b3d3379d4265425
Related-PROD: PROD-24685
diff --git a/_modules/neutronv2/__init__.py b/_modules/neutronv2/__init__.py
index 85db2b7..e275af6 100644
--- a/_modules/neutronv2/__init__.py
+++ b/_modules/neutronv2/__init__.py
@@ -12,6 +12,7 @@
 from neutronv2 import subnets
 from neutronv2 import agents
 from neutronv2 import routers
+from neutronv2 import common
 
 
 network_get_details = networks.network_get_details
@@ -62,6 +63,8 @@
 
 wait_for_network_services = agents.wait_for_network_services
 
+wait_for_api_ready = common.wait_for_api_ready
+
 __all__ = (
     'network_get_details', 'network_update', 'network_delete', 'network_list',
     'network_create', 'network_bulk_create', 'subnetpool_get_details',