fence agents: Option for setting port for telnet/ssh/ssl used by fence agent
    
    On some fencing devices there is possibility to change default port where
    ssh/ssl/telnet/... is listening. There is new option 'ipport' (getopt: -u)
    which can be used for this purpose. It is probable that it will make option
    'udpport' (also -u; currently used in SNMP based agents) obsoleted in one
    of the next versions.
    
    Resolves Red Hat Bugzilla: #506928