extras: clean up a brick's gfid xattr

* extras/clear_xattrs.sh: This script enables a brick from a
deleted volume(stale brick) to be used in a new volume by
clearing all the trusted.gfid xattr from the brick tree.

* One should run this script on all machines which have
stale bricks if one wants to re-use the same bricks
for a new volume.

NOTE: This script *SHOULD BE RUN ONLY AFTER STOPPING A VOLUME*,
thereby ensuring that no replace-brick or rebalance operations
are on-going.

Change-Id: I35a4a2784fe502749184b87299b1a043b8e48e90
BUG: 765572
Signed-off-by: Rajesh Amaravathi <rajesh@redhat.com>
Reviewed-on: http://review.gluster.com/781
Reviewed-by: Amar Tumballi <amar@gluster.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

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