EX-4270 kernel: increase kernel version to ddn16

EX-4270 kernel: increase kernel version to ddn16

Increase kernel build version to -ddn16 due to new kernel patch.

Lustre-change: https://review.whamcloud.com/45869
Lustre-commit: 9cb39cdf470f444decaf183af7b4b6f6a79f80bf

Fixes: afd8b0df0aba ("EX-4270 snapshot: avoid call quota op recursively")
Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Icf0d404ea5ebfb1009078a286585d837b37417ea
Reviewed-by: Li Xi <lixi@ddn.com>
Reviewed-on: https://review.whamcloud.com/46023
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>