Use modprobe to load modules at initramfs stage instead of using cloud-init.

[masteryyh]

Signed-off-by: Yanhong Yang yanhong.yang@suse.com

Related issue:
#3366

Test steps:

1. Prepare a iPXE installation environment, in config.yaml add these modules:

# ...
os:
  modules:
    - kvm
    - nvme
    - vhost_net
# ...

2. Install a Harvester instance using iPXE;
3. After boot up, enter the console and use command lsmod | grep nvme to check if nvme module loaded;
4. Use command lsmod | grep vhost_net to check if vhost_net module loaded;

[bk201]

LGTM! works.

[guangbochen]

LGTM, thanks.
And @masteryyh if it is confirmed as a bug, please help to track it in the upstream https://github.com/rancher/elemental-toolkit repo, thanks.

[futuretea]

LGTM