3.18-stable patches

3.18-stable patches

added patches:
	bridge-check-brport-attr-show-in-brport_show.patch
	fib_semantics-don-t-match-route-with-mismatching-tclassid.patch
	hdlc_ppp-carrier-detect-ok-don-t-turn-off-negotiation.patch
	ipv6-sit-work-around-bogus-gcc-8-wrestrict-warning.patch
	net-fix-race-on-decreasing-number-of-tx-queues.patch
	net-ipv4-don-t-allow-setting-net.ipv4.route.min_pmtu-below-68.patch
	netlink-ensure-to-loop-over-all-netns-in-genlmsg_multicast_allns.patch
	ppp-prevent-unregistered-channels-from-connecting-to-ppp-units.patch
	s390-qeth-fix-ipa-command-submission-race.patch
	s390-qeth-fix-setip-command-handling.patch
	sctp-fix-dst-refcnt-leak-in-sctp_v6_get_dst.patch
	sctp-verify-size-of-a-new-chunk-in-_sctp_make_chunk.patch
	udplite-fix-partial-checksum-initialization.patch