add host action for updating all instances
add host action for updating all instances

citrix-openstack-build/python-troveclient,Tesora/tesora-python-troveclient,Tesora/tesora-python-troveclient,citrix-openstack/build-python-troveclient,cp16net/python-troveclient,openstack/python-troveclient,cp16net/python-troveclient,openstack/python-troveclient,metacloud/python-troveclient,citrix-openstack-build/python-troveclient,metacloud/python-troveclient,citrix-openstack/build-python-troveclient