QA » openQA Project » openQA Tests » qe-yam

### Observation

With **Build 24.1** we get a systematic failure in bootloader_start on S390x (kvm and zvm): S390x:

Example: https://openqa.suse.de/tests/9563755#step/bootloader_start/37

First line in the output says

~~~
# wait_serial expected: " Starting YaST2 "
~~~
but at the end when YaST starts the message is:
~~~
*** Starting YaST ***
~~~



Fix should be easy by adjusting the trigger text.

### Scope

YaST validation tests.

### Acceptance criteria


**AC1:** Trigger text is adjusted, tests no longer fail in bootloader_start
**AC2:** Adjusted code doesn't break other products (apparently this change is only in SLE-15-SP5)

### Additional info


YaST team told us, that the YaST startup message intentionally changed because of this commit:
https://github.com/yast/yast-installation/commit/462733aca602bb2cf9eb8f309b9c58620b7f2938

[wait_serial](http://open.qa/api/testapi/#_wait_serial) takes regex as parameter, favor that solution over if/else statements in code.