Add agama installation for s390x kvm

[rfan1]

• Verification run:
  https://openqa.suse.de/tests/16296575
  https://openqa.suse.de/tests/16296574

Changes as below:

1. Added root.password to boot parameters
2. Activated agama.auto and agama.install_url in specific_bootmenu_params
3. Skipped remote_install_bootmenu_params and registration_bootloader_cmdline for the time being
4. Force checking agama installer is started

---

The failed job is known issue https://bugzilla.suse.com/show_bug.cgi?id=1234264
At the same time, we may need to handle tests/installation/performing_installation/reconnect_after_reboot.pm:19: assert_shutdown_and_restore_system('reboot', 180); as well

[rfan1]

Now xml configuration is

<os>
<type>hvm</type>
<initrd>/var/lib/libvirt/images/openQA-SUT-9.initrd</initrd>
<kernel>/var/lib/libvirt/images/openQA-SUT-9.kernel</kernel>
<cmdline>ifcfg=dhcp root=live:http://openqa.suse.de/assets/iso/agama-installer.s390x-10.0.0-SLE-Build40.10.iso live.password=xxx agama.auto=http://worker31.oqa.prg2.suse.org:20093/tMCnTdVkSoQuQzH_/files/yam/agama/auto/default_sle_no_scc.jsonnet </cmdline>
</os>

[tinawang123]

LGTM

[rfan1]

Thanks all for your input, let me merge this PR as a milestone as well. I will add post script and handle root login for all remote workers [ipmi/powervm/s390x-kvm] next step

More detail info can be found at https://progress.opensuse.org/issues/173758