glusterd/ afr : set afr pending xattrs on replace brick

This patch is part one 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 happens from the replaced (sink) brick
rather than the source brick leading to data loss.

Solution: During the commit phase of replace brick, after old
brick is brought down, create a temporary mount and perform
setfattr operation (on virtual xattr) indicating AFR to mark
the replaced brick as sink.

As a part of this change replace-brick command is being changed
to use mgmt_v3 framework rather than op-state-machine framework.

Many thanks to Krishnan Parthasarathi for helping me out on this.

Change-Id: If0d51b5b3cef5b34d5672d46ea12eaa9d35fd894
BUG: 1207829
Signed-off-by: Anuradha <atalur@redhat.com>
Reviewed-on: http://review.gluster.org/10076
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

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