WIP Node Platform - Add support for settable user variables

* Update Openshift mcollective agent and ddl
* Move gear ssh key creation to happen when gear created
* Added oo-user-var-add/remove/list commands
* Create .env/user_vars when creating gear
Bug 988759 - Failed to override the existing variables
Bug 988691 - Failed to add the 25th user variables
User vars node changes:
  - Use 'user-var-add' mcollective call for *add* and/or *push* user vars. This will reduce unnecessary additional code/complexity.
  - Minor bug fixes
Added User environment variables support in broker
Added REST api support for user environment variables