Enable multi-agent support

even when q-svc is disabled, i.e. on node without q-svc in multi-agent architecture,
state_path will be configured in quantum.conf so that agent doesn't crashs anymore

Bug 1156685

Change-Id: I28625e4b606fa61c35179248321632d3d797c547
Merge "Enable multi-agent support"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp