4.15-stable patches

4.15-stable patches

added patches:
	cls_u32-add-missing-rcu-annotation.patch
	ip6mr-fix-stale-iterator.patch
	ipv6-addrconf-break-critical-section-in-addrconf_verify_rtnl.patch
	ipv6-change-route-cache-aging-logic.patch
	ipv6-fix-so_reuseport-udp-socket-with-implicit-sk_ipv6only.patch
	net-igmp-add-a-missing-rcu-locking-section.patch
	net-ipv6-send-unsolicited-na-after-dad.patch
	net-sched-fix-use-after-free-in-tcf_block_put_ext.patch
	net_sched-get-rid-of-rcu_barrier-in-tcf_block_put_ext.patch
	qlcnic-fix-deadlock-bug.patch
	qmi_wwan-add-support-for-quectel-ep06.patch
	r8169-fix-rtl8168ep-take-too-long-to-complete-driver-initialization.patch
	revert-defer-call-to-mem_cgroup_sk_alloc.patch
	rocker-fix-possible-null-pointer-dereference-in-rocker_router_fib_event_work.patch
	soreuseport-fix-mem-leak-in-reuseport_add_sock.patch
	tcp-release-sk_frag.page-in-tcp_disconnect.patch
	tcp_bbr-fix-pacing_gain-to-always-be-unity-when-using-lt_bw.patch
	vhost_net-stop-device-during-reset-owner.patch