need to update setAuthenticator due to dev side change

dev has tighten the setAuthenticator for NotNull, which cause 23 Android function test failed. need to fix for all platforms

test_replication_push_replication_without_authentication
test_replication_configuration_with_headers
test_push_replication_error_event[10]
test_push_replication_error_event[1000]
test_replication_access_revoke_event[10]
test_replication_access_revoke_event[100]
test_replication_delete_event[10]
test_replication_delete_event[100]
test_replication_push_filtering[10]
test_replication_push_filtering[100]
test_replication_push_filtering[1000]
test_replication_pull_filtering[10]
test_replication_pull_filtering[100]
test_replication_pull_filtering[1000]
test_replication_filter_deleted_document[10]
test_replication_filter_deleted_document[100]
test_replication_filter_deleted_document[1000]
test_replication_filter_access_revoke_document[10]
test_replication_filter_access_revoke_document[100]
test_replication_filter_access_revoke_document[1000]
test_filter_retrieval_with_replication_restart[10]
test_filter_retrieval_with_replication_restart[100]
test_filter_retrieval_with_replication_restart[1000]