CFY-1373 use new ctx api for relationship operations
CFY-1373 fixed unit tests
CFY-1373 ctx.source/target
Merge branch 'master' into CFY-1373-ctx-source-target

Conflicts:
	neutron_plugin/router.py
CFY-1373 get openstack_config from source/target in rel
CFY-1373 fixed mock in cinder test
Merge pull request #25 from cloudify-cosmo/CFY-1373-ctx-source-target

CFY-1373 use new ctx api for relationship operations