LU-11876 dkms: Add missing Requires for zlib-devel

LU-11876 dkms: Add missing Requires for zlib-devel

lustre.spec has BuildRequires for zlib-devel, and lustre-*-dkms should
also Requires zlib-devel so build completes successfully.

Test-Parameters: trivial
Signed-off-by: Nathaniel Clark <nclark@whamcloud.com>
Change-Id: Icf1c3f4342823502200d3326c63fe991c3140aab
Reviewed-on: https://review.whamcloud.com/34065
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Joe Grund <jgrund@whamcloud.com>
Reviewed-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>