openqa/worker: set up swtpm service on tap worker hosts
swtpm is a TPM emulator we want to use for testing Clevis on
IoT (and potentially other things in future). We're implementing
this by having os-autoinst just add the qemu args but expect
swtpm itself to be running already - that's counted as the
sysadmin's responsibility. My approach to this is to have openQA
tap worker hosts also be tpm worker hosts, meaning they run one
instance of swtpm per worker instance (as a systemd service) and
are added to a 'tpm' worker class which tests can use to ensure
they run on a suitably-equipped worker. This sets up all of that.
We need a custom SELinux policy module to allow systemd to run
swtpm - this is blocked by default.
Signed-off-by: Adam Williamson <awilliam@redhat.com>