kernel: Add zfs kmod build to the kernel build
kernel: Add zfs kmod build to the kernel build

This adds building the zfs-kmod package to the kernel build.
The zfs-kmod packages contains the matching ZFS kernel modules
for a given kernel in /lib/modules/$(uname -r)/extra.

The zfs-kmod package also contains the standard kernel modules
and depmod is run over them so that modprobe works

The zfs-kmod package is not build by default due to unclarity
about licenses. Users will have to build it themselves.

Signed-off-by: Rolf Neugebauer <6fdd1d8677ab4fbcb4df3eff6e190c3298f7f742@docker.com>

konstruktoid/linuxkit,davefreitag/linuxkit,furious-luke/linuxkit,zx2c4/linuxkit,furious-luke/linuxkit,eyz/linuxkit,t-koulouris/linuxkit,ndauten/linuxkit,justincormack/linuxkit,thebsdbox/linuxkit,mor1/linuxkit,djs55/linuxkit,JohnnyLeone/linuxkit,YuPengZTE/linuxkit,linuxkit/linuxkit,furious-luke/linuxkit,justincormack/linuxkit,linuxkit/linuxkit,JohnnyLeone/linuxkit,rn/linuxkit,yankcrime/linuxkit,justincormack/linuxkit,JohnnyLeone/linuxkit,rn/linuxkit,linuxkit/linuxkit,YuPengZTE/linuxkit,davefreitag/linuxkit,zx2c4/linuxkit,davefreitag/linuxkit,djs55/linuxkit,thebsdbox/linuxkit,mor1/linuxkit,linuxkit/linuxkit,davefreitag/linuxkit,t-koulouris/linuxkit,konstruktoid/linuxkit,yankcrime/linuxkit,thebsdbox/linuxkit,ndauten/linuxkit,YuPengZTE/linuxkit,deitch/linuxkit,eyz/linuxkit,konstruktoid/linuxkit,deitch/linuxkit,JohnnyLeone/linuxkit,eyz/linuxkit,ndauten/linuxkit,rn/linuxkit,rn/linuxkit,justincormack/linuxkit,rn/linuxkit,JohnnyLeone/linuxkit,eyz/linuxkit,zx2c4/linuxkit,ndauten/linuxkit,t-koulouris/linuxkit,yankcrime/linuxkit,linuxkit/linuxkit,yankcrime/linuxkit,konstruktoid/linuxkit,djs55/linuxkit,davefreitag/linuxkit,YuPengZTE/linuxkit,t-koulouris/linuxkit,furious-luke/linuxkit,justincormack/linuxkit,mor1/linuxkit,djs55/linuxkit,zx2c4/linuxkit,ndauten/linuxkit,djs55/linuxkit,justincormack/linuxkit,mor1/linuxkit,furious-luke/linuxkit,thebsdbox/linuxkit,konstruktoid/linuxkit,deitch/linuxkit,thebsdbox/linuxkit,ndauten/linuxkit,yankcrime/linuxkit,mor1/linuxkit,deitch/linuxkit,yankcrime/linuxkit,deitch/linuxkit,thebsdbox/linuxkit,zx2c4/linuxkit,eyz/linuxkit,t-koulouris/linuxkit,eyz/linuxkit,YuPengZTE/linuxkit,konstruktoid/linuxkit,YuPengZTE/linuxkit