A number of fixes/enhancements for the ipfilter rc script:

- Use a more robust check to determine if we need to load ipl.ko.
- Don't try to run ipf -E if ipfilter is already enabled.  Look at
  the net.inet.ipf.fr_running sysctl to figure this out.  This fixes
  a warning message about ipfilter being already initialized.
- Only one ipf -E command is needed.  We don't need an extra one for
  the -6 case which would only print a warning message about ipfilter
  being already initialized.
- Fix one occurence where we were running /sbin/ipf directly without
  using the ${ipfilter_program} variable if set.
- In ipfilter_stop(), don't try to save the firewall state tables if
  ipfilter is disabled.  Similarly, don't try to disable it if it's
  already disabled.  This fixes some more error messages.

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