Hbase connector does not have working tests

**Describe the bug**

Hbase connector does not have working tests, thus its state and compatibility with various library changes is unclear.

**To Reproduce**

The only useful test (let's ignore HbaseSinkConfigTest test) is `HbaseGenericRecordSinkTest` with one test method which is disabled since the day it was committed in Jan 2019 https://github.com/apache/pulsar/pull/3368 :
https://github.com/apache/pulsar/blob/9fe2f418200f4231326fc273e5671c5536b9bf65/pulsar-io/hbase/src/test/java/org/apache/pulsar/io/hbase/sink/HbaseGenericRecordSinkTest.java#L84-L85

I tried enabling the test and running it on my mac, the test resulted in panic and MacOS crash.

Integration tests were never finished and committed: https://github.com/apache/pulsar/pull/3695

**Expected behavior**

Working set of tests covering functionality, running on CI

Start with pulsar-io/hbase/src/test/java/org/apache/pulsar/io/hbase/sink/HbaseGenericRecordSinkTest.java, especially the disabled test noted in the issue, and review the unfinished integration-test pull request. Run the existing HBase connector tests in the project’s CI environment rather than enabling the test locally first. Done means a working test set covering connector functionality and running successfully on CI.

Written by the indexing model from the issue text.