shelldriver: fixes and improvements

[ynezz]

Description

• shelldriver: make run wrapper injecting more reliable
• shelldriver: make kernel silencing more reliable
• shelldriver: fix missing kernel silencing on password less consoles
• shelldriver: make post_login_settle_time generally available

Checklist

• [x] PR has been tested

Cc: @JoshuaWatt

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 8.10811% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 62.6%. Comparing base (69fd553) to head (65d0269). Report is 295 commits behind head on master.

Files	Patch %	Lines
labgrid/driver/shelldriver.py	8.1%	34 Missing :warning:

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #945     +/-   ##
========================================
- Coverage    62.7%   62.6%   -0.2%     
========================================
  Files         159     159             
  Lines       11658   11687     +29     
========================================
+ Hits         7319    7321      +2     
- Misses       4339    4366     +27     

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[aparcar]

Tested this with a Turris Omnia and it fixes the ShellDriver issues as described.

[aparcar]

While this fixes "real world" devices, it break the QEMU driver for me, muting all shell output. I'll investigate further and give more details once I got them.

[ynezz]

@Bastian-Krause thanks a lot for a review, really appreciate it! I'll rebase and retest soon.