Re-submission of the regular kernel update with SLE12-SP3 sync.
At this time, including more btrfs fixes that are worth to test via openQA.

- blacklist.conf:
Add some vrf-related entries
- commit 01af61e

- net: icmp_route_lookup should use rt dev to determine L3 domain
(bsc#104774).
- net: ipv6: Fix processing of RAs in presence of VRF
(bsc#104774).
- xfrm: Only add l3mdev oif to dst lookups (bsc#104774).
- net: Don't delete routes in different VRFs (bsc#104774).
- net: vrf: Switch dst dev to loopback on device delete
(bsc#104774).
- net: vrf: Fix crash when IPv6 is disabled at boot time
(bsc#104774).
- net: vrf: protect changes to private data with rcu (bsc#104774).
- net: vrf: Create FIB tables on link create (bsc#104774).
- net: vrf: Fix dev refcnt leak due to IPv6 prefix route
(bsc#104774).
- net: vrf: Fix dst reference counting (bsc#104774).
- net: make netdev_for_each_lower_dev safe for device removal
(bsc#104774).
- net: l3mdev: Add master device lookup by index (bsc#104774).
- vrf: remove slave queue and private slave struct (bsc#104774).
- commit 8d4a53d

- btrfs: add cond_resched to btrfs_qgroup_trace_leaf_items
(bsc#1028286 bsc#1017461 bsc#1036171).
- btrfs: clean up extraneous computations in add_delayed_refs
(bsc#974590 bsc#1030061 bsc#1022914 bsc#1017461).
- btrfs: allow backref search checks for shared extents