Issue #358 - rework testGoOffline to be a mock.

https://github.com/couchbase/couchbase-lite-android/issues/358
Issue #358 - rework RouterTest#testPullReplicate to be a mock.

https://github.com/couchbase/couchbase-lite-android/issues/358
Issue #358 - rework RouterTest#testPushReplicate to be a mock.

https://github.com/couchbase/couchbase-lite-android/issues/358
Issue #358 - rework testGetActiveReplications to be a mock.

https://github.com/couchbase/couchbase-lite-android/issues/358
Issue #358 - Mark test as failing: testMockBulkPullSyngGw

https://github.com/couchbase/couchbase-lite-android/issues/358