staging: lustre: update the MODULE_DESCRIPTION for all lustre modules

Fixup the MODULE_DESCRIPTION for several lustre modules. Some wrongly
place the version in the string or they are not descriptive enough.
Broken out of patch http://review.whamcloud.com/16787

.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6204
Reviewed-on: http://review.whamcloud.com/16787


Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>