chop/USERGRID-136 Fixes ssh bug during setup stack

- waitActive method reactivated and moved into Job, avoiding a possible
  race condition
- RuntimeJob class introduced, having the same functionality with Job,
  but forking local ssh client
- fixed a typo in SetupStackThread which caused runner instance setup to fail
Merge pull request #137 from usergrid/chop/USERGRID-136

chop/USERGRID-136 Fixes ssh bug during setup stack