CLOUDIFY-1996

verify_plugin tasks also extract argument of operation and return it upon successful verification instead of True
CLOUDIFY-1996

pass returned argument list to the execute task participant
CLOUDIFY-1996

Add argument passed to the task execution logging
Merge branch 'develop' into feature/CLOUDIFY-1996-show-pluging-execution-params-on-event
Merge pull request #56 from CloudifySource/feature/CLOUDIFY-1996-show-pluging-execution-params-on-event

Feature/cloudify 1996 show pluging execution params on event