hook-scripts: Move smb hooks to right place.

Moved the hook-scripts to dirs corresponding to event.
Also, edited S30samba-set.sh to with changes in
other two hook scripts to bring uniformity.

Change-Id: Ib98c0a18d4bb5d0ba4b881b2e19b40d72580b1c2
BUG: 1073468
Signed-off-by: Raghavendra Talur <rtalur@redhat.com>
Reviewed-on: http://review.gluster.org/7201
Reviewed-by: Poornima G <pgurusid@redhat.com>
Reviewed-by: Bala FA <barumuga@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>