use same etcd data directory regardless of version

This introduces a known issue next deploy, but prevents it from happening
every time we upgrade the etcd version. The fix is to stop all etcds, blow
away their data directories, and start them again.

[finishes #66790592]

Signed-off-by: Alex Suraci <asuraci@pivotallabs.com>
Merge remote-tracking branch 'origin/pr/328' into develop
Added description and support_address
Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Chris Adams:
     Remove remaining references to `hm9000_noop` ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/21533509 )
     Merge pull request #179 from cloudfoundry/asap/remove_health_manager ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/21533169 )
  Aram Price:
     Remove old "health_manager_next" code and references ( Travis Unknown )