fencing: Replace syslog.syslog() calls with new logging handler

Original logging handler for syslog writes everything to a device but that
way we will have incorrect source. New logging handler is created on top
of standard old-style syslog library.
fencing: 'nodename' should not be logged as ignored argument

nodename is send by default, so there is not reason to log it.
Merge branch 'master' of https://git.fedorahosted.org/git/fence-agents