LU-6718 build: force update of lustre-osd-ldiskfs-mount

LU-6718 build: force update of lustre-osd-ldiskfs-mount

Change the .spec file to make lustre-osd-ldiskfs require a
specific version of lustre-osd-ldiskfs-mount rather than
accepting just any version.

Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Change-Id: If12f8cb6d1a9d7105b7bfb04503acf437e189d46
Reviewed-on: http://review.whamcloud.com/15227
Tested-by: Jenkins
Reviewed-by: Brian J. Murrell <brian.murrell@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>