minor: fix to help string and strip whitespace from inputs

The first change just makes the help string match the actual parameter name.  The parameter is `--room` but the help string used `--room_id`.

The second change strips leading and trailing whitespace from input parameters so that:

    $SERVICEDESC$|$HOSTALIAS$|... 

will be treated the same as

    $SERVICEDESC$| $HOSTALIAS$|...

This was a problem in my configuration because it wasn't matching on `ntype` because there was a space in front of it.