Fix provisioning progress calculation

* don't send ready status in provision handler
  because nodes are not provisioned yet in
  this handler
* fix undefined variable in provision handler
* fix nodes calculations statuses in
  watch_provision_progress method. Firstly get
  all nodes in error status, then retrieve nodes
  which ready and add their status to result
  variable.
* fix typo in logs

Closes-bug: #1257342
Closes-bug: #1249994
Change-Id: I56e06ade671795fc8c87b7e84e159df7abdba34b
Merge "Fix provisioning progress calculation"