LU-13530 build: Add kernel version to depmod

LU-13530 build: Add kernel version to depmod

The depmod commands in the postrm and
postinst scripts should use the kernel
version the package is built against.
Otherwise, depmod will use the current
kernel version - which might be different.

This patch also adds a line indicating that
the file has been modified.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I355420a85ea0ed301433816588758197795b5ede
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49573
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Aurelien Degremont <degremoa@amazon.com>
Reviewed-by: Thomas Stibor <thomas@stibor.net>
Reviewed-by: Oleg Drokin <green@whamcloud.com>