Avoid time.sleep in TestRecentSequenceHistory (#3046)
Avoid time.sleep in TestRecentSequenceHistory (#3046)

* Avoid time.sleep in TestRecentSequenceHistory

Also removes hardcoded test expectations for value of kMaxRecentSequences

* Updated based on PR feedback

ceejatec/sync_gateway,ceejatec/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,ceejatec/sync_gateway,ceejatec/sync_gateway