Revamp supervisor docker, Create host upgrade w/o supervisor

- Create new file host-upgrade.pp that should be used for Fuel
  upgrades instead of host-only.pp. Upgrade mode excludes
  supervisor from upgrades. Fuel upgrade utility will install
  new supervisor configuration independent of Puppet.
- Refactor dockerctl attach function to provide possibility to
  correctly handle SIGINT sent from supervisord during stop
  process. In order to do so we fork "docker attach" and run loop
  in order to "trap" (catch) SIGINT/SIGTERM and shutdown container
  properly
- Use SIGTERM instead of SIGINT for dhcrelay_monitor supervisor
  service, because we have "sleep 30" loop in the monitor script,
  so it will handle SIGINT only when sleep ends.
- Break dependency of docker build on supervisor

Change-Id: I100c7705eb5515158bd940519fc02323c0bbe983
Related-bug: #1350764
Partial-bug: #1358144
Merge "Revamp supervisor docker, Create host upgrade w/o supervisor"