common-utils: Simplified mkdir_p interface and put it to use.

- Simplified mkdir_p interface.
- Removed mkdir_if_missing from codebase
- Modified glusterd consumers of mkdir_if_missing to use mkdir_p
  with allow_symlinks=_gf_true. This implicitly assumes that glusterd
  is in 'control' of the brick path and glusterd's working dir in the sense
  that the symlinks (if any) in any of the above mentioned paths are under
  the 'storage administrator's control.

Change-Id: I7383ad5cff11b123e1e0d2fe6da0c81e03c52ed2
BUG: 823132
Signed-off-by: Krishnan Parthasarathi <kp@gluster.com>
Reviewed-on: http://review.gluster.com/3378
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

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