cassandra-dtest issues

Please see: [CASSANDRA-16983](https://issues.apache.org/jira/browse/CASSANDRA-16983) and the [pull request #1220](https://github.com/apache/cassandra/pull/1220) for apache/cassandra.

bowensong

Relax limitations on test_multi_dc_replace_with_rf1

test_multi_dc_replace_with_rf1 was failing without vnodes long time ago for some now unknown reason. Now there is an empirical evidence that the test doesn't fail any more. Thus the requirements to...

k-rus

CASSANDRA-16104 Add test for warning on nodetool jobs option

adelapena

[CASSANDRA-16451] Add ability to ttl snapshots

fibersel

CASSANDRA-16729 - user_types_test.py::TestUserTypes::test_type_keyspace_permission_isolation uses retries to avoid flakyness

dcapwell

CASSANDRA-16683 - fixed offline_tools_test.py::TestOfflineTools::test_sstableverify to validate tool fails and update to match the actual exception thrown

dcapwell

CASSANDRA-15892 Remove flaky annotation from `test_resumable_rebuild` and add ignore-log pattern

Once https://github.com/grighetto/cassandra/pull/3 is applied to C*, the referred test in this PR shouldn't be flaky anymore. Also, ignored an additional log message that may come up while the channel is...

grighetto