First draft - removing hbase - success compile

[sahusanket]

[sahusanket]

Hi @chtyim , Please review this PR for removing hbase

• I have tried to replace hbase with levelDB for some implementations and injections.

• Removed hbase references in JAVA code.

• There are few parts i am not sure : i.e. there are parts were only hbase is being used.

  • cdap-common/bin/functions.sh
  • cdap-master/src/main/java/io/cdap/cdap/data/runtime/main/MasterServiceMain.java
  • I have removed hbase refs but i am not sure if we still support the above usecases ? like cdap scripts ?

Testing :

• Build sandbox, and ran basic operations, connections, pipeline run etx..all successful

• Ran cdap-ui e2e test on above sandbox, seems successful

• Replaced image in a GKE cluster ( CDF ) and tested basic operations/runs and it worked successfully.

Please let me know are there any other testing that i need to perform to ensure everything is working fine.