[Bug 200321] pfSync generates demotion events to carp when not needed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200321

            Bug ID: 200321
           Summary: pfSync generates demotion events to carp when not
                    needed
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: eri at pfsense.org

Created attachment 156929
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=156929&action=edit
Prevent pfsync/carp demotions when value is 0

pfSync generates demotion events even when net.pfsync.carp_demotion_factor is
0.
The same applies to the carp net.inet.carp.senderr_demotion_factor is 0.

This triggers unneeded events on the system which might impact availability of
the carp ip.

Attached patch just skips these events in case the values are 0, meaning
administratively disable the event.

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