Fixed some RPC casts and context problems that happened during a rebase.
Fixed some RPC casts and context problems that happened during a rebase.

zhujzhuo/openstack-trove,hplustree/trove,denismakogon/trove-guestagent,zhangg/trove,redhat-openstack/trove,changsimon/trove,zhujzhuo/openstack-trove,citrix-openstack-build/trove,changsimon/trove,cp16net/trove,zhangg/trove,mmasaki/trove,fabian4/trove,citrix-openstack-build/trove,cp16net/trove,citrix-openstack/build-trove,changsimon/trove,mmasaki/trove,redhat-openstack/trove,mmasaki/trove,openstack/trove,hplustree/trove,denismakogon/trove-guestagent,citrix-openstack/build-trove,redhat-openstack/trove,fabian4/trove,fabian4/trove,citrix-openstack/build-trove,openstack/trove,cp16net/trove,zhujzhuo/openstack-trove,citrix-openstack-build/trove