[Bug 214613] Reloading pf rules breaks connections on lo0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214613

            Bug ID: 214613
           Summary: Reloading pf rules breaks connections on lo0
           Product: Base System
           Version: 10.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: longwitz at incore.de

Created attachment 177126
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177126&action=edit
patch against FreeBSD 10 Stable r308323

With the line "set skip on lo0" in /etc/pf.conf reloading the pf rules with
"pfctl -f /etc/pf.conf" breaks any active running connections on lo0.

Example:
scp bigfile 127.0.0.1:/var/tmp/bigfile
bigfile                                34%  345MB  86.4MB/s   00:07 ETAF
ssh_packet_write_poll: Connection to 127.0.0.1 port 22: Permission denied
lost connection

This problem is long standing and discussed in
lists.freebsd.org/pipermail/freebsd-pf/2013-March/006961.html,
the attached patch is adapted from 
lists.freebsd.org/pipermail/freebsd-pf/2013-April/006994.html.

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