MiniMRYarnCluster has hard-coded timeout waiting to start history server, with no way to disable

Over in HBase, we've been chasing intermittent Jenkins failures in tests involving  MiniMRYarnCluster. In the latest incantion, HBASE-24493, we finally tracked this down to a hard-coded 60sec timeout in MiniMRYarnCluster on bringing up the JobHistoryServer... a feature we cannot disable for the purpose of this test. We've had to disable running these tests for the time being, which is less than ideal.

Would be great for MiniMRYarnCluster to (1) make JHS optional and/or (2) make this timeout duration configurable.