Merge 4.4.174 into android-4.4

Changes in 4.4.174
	inet: frags: change inet_frags_init_net() return value
	inet: frags: add a pointer to struct netns_frags
	inet: frags: refactor ipfrag_init()
	inet: frags: refactor ipv6_frag_init()
	inet: frags: refactor lowpan_net_frag_init()
	rhashtable: add rhashtable_lookup_get_insert_key()
	rhashtable: Add rhashtable_lookup()
	rhashtable: add schedule points
	inet: frags: use rhashtables for reassembly units
	net: ieee802154: 6lowpan: fix frag reassembly
	ipfrag: really prevent allocation on netns exit
	inet: frags: remove some helpers
	inet: frags: get rif of inet_frag_evicting()
	inet: frags: remove inet_frag_maybe_warn_overflow()
	inet: frags: break the 2GB limit for frags storage
	inet: frags: do not clone skb in ip_expire()
	ipv6: frags: rewrite ip6_expire_frag_queue()
	rhashtable: reorganize struct rhashtable layout
	inet: frags: reorganize struct netns_frags
	inet: frags: get rid of ipfrag_skb_cb/FRAG_CB
	inet: frags: fix ip6frag_low_thresh boundary
	ip: discard IPv4 datagrams with overlapping segments.
	net: modify skb_rbtree_purge to return the truesize of all purged skbs.
	ipv6: defrag: drop non-last frags smaller than min mtu
	net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends
	ip: use rb trees for IP frag queue.
	ip: add helpers to process in-order fragments faster.
	ip: process in-order fragments efficiently
	ip: frags: fix crash in ip_do_fragment()
	ipv4: frags: precedence bug in ip_expire()
	inet: frags: better deal with smp races
	net: fix pskb_trim_rcsum_slow() with odd trim offset
	net: ipv4: do not handle duplicate fragments as overlapping
	rcu: Force boolean subscript for expedited stall warnings
	Linux 4.4.174

Change-Id: I47eace4f47ffe0bf16b29615d09ed903c40a272b
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>