ENG-7195: Add deployment interface
ENG-7195: refactor.
ENG-7195: review changes and get deployment from zookeeper.
Merge branch 'master' into ENG-7195
Merge branch 'master' into ENG-7195
ENG-7195: review changes.
Merge pull request #1858 from VoltDB/ENG-7195

Eng 7195