xfs: Update 2 for 4.5-rc1

This update contains:

o promotion of XFS_IOC_FS[GS]ETXATTR ioctl to the vfs level so that
  it can be shared with other filesystems. The ext4 project quota
  functionality is the first target for this. The commits in this
  series have not been updated with review or final SOB tags because
  the branch they were originally published in was needed by ext4.
  Those tags are:

  Reviewed-by: Theodore Ts'o <tytso@mit.edu>
  Signed-off-by: Dave Chinner <david@fromrobit.com>

o Revert a change that is causing suspend failures.
o Fix a use-after-free that can occur on log mount failures. Been
  around forever, but now exposed by other changes to log recovery
  made in the first 4.5 merge.
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