mount.glusterfs:export PATH environment variable

Problem: spurious warning:
mount -t glusterfs 10.70.7.228:repvol /mnt/fuse_mnt/
WARNING: getfattr not found, certain checks will be skipped..

Fix:
export PATH so that getfattr search succeeds.

Change-Id: Ib19e2899e43a7d763a136b9fbc90823f743597a5
BUG: 1040348
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-on: http://review.gluster.org/6545
Reviewed-by: Harshavardhana <harsha@harshavardhana.net>
Tested-by: Harshavardhana <harsha@harshavardhana.net>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>