[FENCE] Fix name of the option in fencing library
[FENCE] Fix name of the option in fencing library

We were testing for option 'plug_no' but in every other file we have 'port'.

stevenraspudic/resource-agents,asp24/resource-agents,asp24/resource-agents,asp24/resource-agents,stevenraspudic/resource-agents,stevenraspudic/resource-agents