Add context to send-echo-to-worker
Add context to send-echo-to-worker

The empty dictionary was no longer sufficient.
Creating an empty RequestContext fixes that.

Change-Id: I5a5776ed87f88e33b39dd5e32af7605ba674d79e

gilbertpilz/solum,gilbertpilz/solum,ed-/solum,stackforge/solum,ed-/solum,devdattakulkarni/test-solum,gilbertpilz/solum,gilbertpilz/solum,ed-/solum,openstack/solum,ed-/solum,openstack/solum,stackforge/solum,devdattakulkarni/test-solum