cluster/afr : set pending xattrs for replaced brick

       Backport of: http://review.gluster.org/10448/
                  & http://review.gluster.org/11416

This patch is part two change to prevent data loss
in a replicate volume on doing a replace-brick commit
force operation.

Problem: After doing replace-brick commit force, there is a
chance that self heal might happen from the replaced (sink) brick
rather than the source brick leading to data loss.

Solution: Mark pending changelogs on afr children for
the replaced afr-child so that heal is performed in the
correct direction.

Credits to Ravishankar N for patch 11416.

Change-Id: Icb9807e49b4c1c4f1dcab115318d9a58ccf95675
BUG: 1232173
Reviewed-on: http://review.gluster.org/10448
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com>
Signed-off-by: Anuradha Talur <atalur@redhat.com>
Reviewed-on: http://review.gluster.org/11254
Tested-by: Gluster Build System <jenkins@build.gluster.com>

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