Fixed help text for new cluster dialog

* In CreateCluster action from cluster templates was used
* In jobs SelectHadoopPluginAction template from cluster templates
  was used
* SelectPlugin and SelectPluginAction in jobs were never used. Probably
  copy-past

Change-Id: I8b0d16403251453b33b92392781bddbae6ff6554
Closes-Bug: #1326465
Merge "Fixed help text for new cluster dialog"