MB-19360: Init mock server in stream module tests
MB-19360: Init mock server in stream module tests

This needs to be done so that time_mutex in mock_server
gets initialized to enable crash-free invocations of
mock_get_current_time and mock_time_travel apis.

Change-Id: I06e6469a227df1108892c9616344ff3789c72cb8
Reviewed-on: http://review.couchbase.org/63367
Well-Formed: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Will Gardner <cbd6f5d9092d9ef7d5c0510d53bba134b22c02f2@couchbase.com>

couchbase/ep-engine,daverigby/kv_engine,teligent-ru/ep-engine,daverigby/ep-engine,couchbase/ep-engine,daverigby/ep-engine,teligent-ru/ep-engine,membase/ep-engine,daverigby/kv_engine,couchbase/ep-engine,daverigby/ep-engine,membase/ep-engine,daverigby/kv_engine,daverigby/kv_engine,teligent-ru/ep-engine,membase/ep-engine,membase/ep-engine,daverigby/ep-engine,teligent-ru/ep-engine,couchbase/ep-engine