Add workaround for missing kernel module z3fold

Changes:

    https://review.opendev.org/c/openstack/devstack/+/890693
    https://review.opendev.org/c/openstack/nova/+/905791

have started enabling zswap + z3fold in devstack.

Our current Ubuntu 22.04 setups error out with:

    $ echo z3fold | sudo tee /sys/module/zswap/parameters/zpool
    z3fold
    tee: /sys/module/zswap/parameters/zpool: No such file or directory

It has been identified that the 'z3fold' kernel module is not installed by
default. Installing it here until it is decided if this step should be moved
to the image creation stage.

Change-Id: I3e9753e6fc26b1e396918b2c9d47cec821689260
2 files changed