LU-8382 hsm: reorder coordinator's cleanup functions

LU-8382 hsm: reorder coordinator's cleanup functions

The functions to initialize the coordinator and its proc entries
were called in the same order as the cleanup ones.
This patch reorders the cleanup functions called in mdt_fini()
according to the error path of mdt_init0().

Signed-off-by: Quentin Bouget <quentin.bouget.ocre@cea.fr>
Change-Id: Ic242b8f02cf44f900541446964297982ad6fc178
Reviewed-on: https://review.whamcloud.com/21207
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Henri Doreau <henri.doreau@cea.fr>
Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>