Support RHEL CoreOS automation testing

[keirazhang]

RHCOS is very like Flatcar. It uses Ignition to customize guest OS after OVA deployment, and for test cases not supported by Flatcar, RHCOS doesn't support either.

VM information:
+-----------------------------------------------------------------+
| Name                      | test_rhcos                          |
+-----------------------------------------------------------------+
| Guest OS Distribution     | RHCOS 4.13 x86_64                   |
+-----------------------------------------------------------------+
| GUI Installed             | False                               |
+-----------------------------------------------------------------+
| CloudInit Version         |                                     |
+-----------------------------------------------------------------+
| VMTools Version           | 12.1.5 (build-20735119)             |
+-----------------------------------------------------------------+
| Config Guest Id           | rhel8_64Guest                       |
+-----------------------------------------------------------------+
| GuestInfo Guest Id        | rhel8_64Guest                       |
+-----------------------------------------------------------------+
| GuestInfo Guest Full Name | Red Hat Enterprise Linux 8 (64-bit) |
+-----------------------------------------------------------------+
| GuestInfo Guest Family    | linuxGuest                          |
+-----------------------------------------------------------------+
| GuestInfo Detailed Data   |                                     |
+-----------------------------------------------------------------+


Test Results (Total: 30, Passed: 21, Failed: 1, Skipped: 8, Elapsed Time: 01:11:21)
+-------------------------------------------------------------------------+
| ID | Name                                 |   Status        | Exec Time |
+-------------------------------------------------------------------------+
| 01 | deploy_vm_ova                        |   Passed        | 00:04:56  |
| 02 | check_inbox_driver                   |   Passed        | 00:02:18  |
| 03 | ovt_verify_install                   | * Not Supported | 00:01:02  |
| 04 | ovt_verify_status                    |   Passed        | 00:01:10  |
| 05 | vgauth_check_service                 |   Passed        | 00:00:53  |
| 06 | check_ip_address                     |   Passed        | 00:00:42  |
| 07 | check_os_fullname                    | * Failed        | 00:01:00  |
| 08 | stat_balloon                         |   Passed        | 00:00:40  |
| 09 | stat_hosttime                        |   Passed        | 00:00:43  |
| 10 | device_list                          |   Passed        | 00:02:21  |
| 11 | check_quiesce_snapshot_custom_script |   Passed        | 00:00:57  |
| 12 | memory_hot_add_basic                 |   Passed        | 00:05:15  |
| 13 | cpu_hot_add_basic                    |   Passed        | 00:05:29  |
| 14 | cpu_multicores_per_socket            |   Passed        | 00:08:04  |
| 15 | check_efi_firmware                   |   Passed        | 00:01:13  |
| 16 | secureboot_enable_disable            |   Passed        | 00:04:19  |
| 17 | e1000e_network_device_ops            |   Passed        | 00:04:20  |
| 18 | vmxnet3_network_device_ops           |   Passed        | 00:03:18  |
| 19 | pvrdma_network_device_ops            | * Not Supported | 00:01:05  |
| 20 | gosc_perl_dhcp                       | * Not Supported | 00:00:43  |
| 21 | gosc_perl_staticip                   | * Not Supported | 00:00:41  |
| 22 | gosc_cloudinit_dhcp                  | * Not Supported | 00:00:36  |
| 23 | gosc_cloudinit_staticip              | * Not Supported | 00:00:40  |
| 24 | paravirtual_vhba_device_ops          |   Passed        | 00:02:34  |
| 25 | lsilogic_vhba_device_ops             |   Passed        | 00:03:12  |
| 26 | lsilogicsas_vhba_device_ops          |   Passed        | 00:02:59  |
| 27 | sata_vhba_device_ops                 |   Passed        | 00:03:09  |
| 28 | nvme_vhba_device_ops                 |   Passed        | 00:02:56  |
| 29 | nvdimm_cold_add_remove               | * Not Supported | 00:01:04  |
| 30 | ovt_verify_uninstall                 | * Not Supported | 00:01:01  |
+-------------------------------------------------------------------------+

[123lzxm]

LGTM, thanks.