Wait for Keystone start after master node reset
Wait for Keystone start after master node reset

Use protected Nailgun API URL to check that Keystone
is up and works fine before running tests.

Change-Id: I28a84f8e2a304e18cf54eb7d08b24f0ef67503f5
Closes-bug: #1401692

Fiware/ops.Fuel-main-dev,dancn/fuel-main-dev,eayunstack/fuel-main,stackforge/fuel-main,zhaochao/fuel-main,teselkin/fuel-main,Fiware/ops.Fuel-main-dev,SergK/fuel-main,huntxu/fuel-main,dancn/fuel-main-dev,eayunstack/fuel-main,SmartInfrastructures/fuel-main-dev,teselkin/fuel-main,AnselZhangGit/fuel-main,ddepaoli3/fuel-main-dev,zhaochao/fuel-main,AnselZhangGit/fuel-main,dancn/fuel-main-dev,huntxu/fuel-main,AnselZhangGit/fuel-main,ddepaoli3/fuel-main-dev,dancn/fuel-main-dev,teselkin/fuel-main,SergK/fuel-main,SmartInfrastructures/fuel-main-dev,ddepaoli3/fuel-main-dev,zhaochao/fuel-main,eayunstack/fuel-main,stackforge/fuel-main,huntxu/fuel-main,Fiware/ops.Fuel-main-dev,zhaochao/fuel-main,SergK/fuel-main,teselkin/fuel-main,SmartInfrastructures/fuel-main-dev,zhaochao/fuel-main,ddepaoli3/fuel-main-dev,AnselZhangGit/fuel-main,stackforge/fuel-main,Fiware/ops.Fuel-main-dev,SmartInfrastructures/fuel-main-dev