Update fuel-ostf specs
Update fuel-ostf specs

Added requirement of python-glanceclient for
Fuel OSTF tests.

Partially implements: blueprint ostf-and-system-tests-for-glance

Change-Id: If0f1f69f0a167e8f04d00b66d03393773c9cb76b

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