LU-9087 build: add support for DKMS debs

LU-9087 build: add support for DKMS debs

This introduces a new package lustre-client-modules-dkms that uses DKMS
to automatically recompile the client kernel modules on kernel upgrades.
The package is only created if the dkms-debs target is used, otherwise
the traditional kernel-specific package is created.

Test-Parameters: trivial
Change-Id: Ie9aeee29f7fd73938b148299d246c663a783ccd3
Signed-off-by: Michael Kuhn <michael.kuhn@informatik.uni-hamburg.de>
Reviewed-on: https://review.whamcloud.com/25328
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Gu Zheng <gzheng@ddn.com>
Reviewed-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>