The plugin's 'convert' method improved.

Prepared cluster template is now passed to the convert plugin call.

Change-Id: I98ffd087be1d21200afe106bcafa7c3bc9ad3b27
NodeGroupTemplate conversion method fixed.

Change-Id: Ib6ebcee76ef4349bdb925a7cffd0c1c8a5c573c6
Merge "The plugin's 'convert' method improved."
Merge "NodeGroupTemplate conversion method fixed."