Enable s390x install tests on sle16

https://progress.opensuse.org/issues/174685

schedule/functional/sle16/agama-create-hdd-textmode_s390x_kvm.yaml

@@ -0,0 +1,15 @@
+name:  agama-create-hdd-textmode_s390x_kvm
+description:    >
+    Install sle16 via agama auto on pvm setup, but it can not publish qcow2 image
+
+schedule:
+    - installation/bootloader_zkvm
+    - installation/agama_reboot
+    - installation/first_boot
+    - console/system_prepare
+    - console/hostname
+    - console/force_scheduled_tasks
+    - shutdown/grub_set_bootargs
+    - shutdown/cleanup_before_shutdown
+    - shutdown/shutdown
+    - shutdown/svirt_upload_assets

tests/installation/agama_reboot.pm

@@ -26,8 +26,9 @@ use version_utils qw(is_leap is_sle);
 use utils;
 use Utils::Logging qw(export_healthcheck_basic);
 use x11utils 'ensure_unlocked_desktop';
-use Utils::Backends qw(is_ipmi is_pvm);
+use Utils::Backends qw(is_ipmi is_pvm is_svirt);
 use Utils::Architectures qw(is_aarch64 is_s390x);
+use power_action_utils 'assert_shutdown_and_restore_system';
 
 sub upload_agama_logs {
     return if (get_var('NOLOGS'));
@@ -73,6 +74,10 @@ sub run {
         # Swith back to sol console, then user can monitor the boot log
         select_console 'sol', await_console => 0 if is_ipmi;
         reconnect_mgmt_console if is_pvm;
+        if (is_s390x && is_svirt) {
+            assert_shutdown_and_restore_system;
+            reconnect_mgmt_console;
+        }
         wait_still_screen 10;
         save_screenshot;
         return;