random failures android 2.8.0-224 with sgw 2.8.0-255

a couple of failures, re-run without problem, need to investigate more:

test_CBL_push_without_pull -  cbl docs are empty , cannot update docs

test_CBL_for_purged_doc - purge document does not exist in CBL after replication assert 'sg_docs_7' in []

test_CBL_SG_replication_with_rev_messages - number of doc ids which got replicated for SGW assert 0 == 5 -0 +5

http://uberjenkins.sc.couchbase.com:8080/job/CBLITE_Android-Listener-TestServer-Functional-tests/2059/testReport/

test_multiple_cbls_updates_concurrently_with_pull

test_replication_pull_filtering

test_replication_filter_access_revoke_document

test_filter_retrieval_with_replication_restart

test_replication_configuration_valid_values

http://uberjenkins.sc.couchbase.com:8080/job/CBLITE_Android-Listener-TestServer-Functional-tests/2057/testReport/