Revision 187031

MFC r181531 to stable/7:
  Improve periodic/security/550.ipfwlimit a bit:
  - don't run it if net.inet.ip.fw.verbose = 0 as it is pointless
  - handle rules without logging limit correctly [1]
  (those rules show up without logamount in "ipfw -a list")

  PR:		conf/126060 [1]
  MFC after:	1 month