Linux 3.15.6.
Don't trigger congestion wait on dirty-but-not-writeout pages
(bnc#879071).
- Linux 3.15.7 (bnc#879071).
- Delete
  patches.fixes/don-t-trigger-congestion-wait-on-dirty-but-not-write.patch.
- Update config files.
- Linux 3.15.8.
- Refresh patches.suse/stack-unwind.
nfs: nfs3_list_one_acl(): check get_acl() result with
IS_ERR_OR_NULL (bko#81111 bnc#889790).