[hotfix] [hbase] Set root log level to OFF for flink-hbase tests.

[fhueske]

What is the purpose of the change

Fix flink-hbase tests that fail on local builds and pass on Travis.

Brief change log

• Set root log level of flink-hbase to OFF
• Log level is changed due to a buggy Calcite check that causes a NPE.
• The check is only performed if log level DEBUG is enabled.

Verifying this change

• Tests on flink-hbase pass.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? n/a

[fhueske]

btw. Calcite fixed the underlying issue in version 1.14 which was release a few days ago.

[zentol]

maybe add a comment to the config file to not set this to debug, otherwise +1.

[StephanEwen]

Will address Zentol's comment and merge. This is blocking me...