Increase grace period for tap tests & xdcr tests
Increase grace period for tap tests & xdcr tests

- Tap tests: From 120 to 180
- XDCR tests: From 30 to 120

Change-Id: Id29580641be151a5446a63f785569145178ada98
Reviewed-on: http://review.couchbase.org/61596
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

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