driver/commandmixin: Add poll_until_success helper function

[nefethael]

Signed-off-by: Vincent Prince vincent.prince.fr@gmail.com

[codecov-io]

Codecov Report

Merging #242 into master will decrease coverage by <.1%.
The diff coverage is 31.2%.

@@           Coverage Diff            @@
##           master    #242     +/-   ##
========================================
- Coverage    58.1%   58.1%   -0.1%     
========================================
  Files         114     114             
  Lines        7040    7056     +16     
========================================
+ Hits         4097    4102      +5     
- Misses       2943    2954     +11

Impacted Files	Coverage Δ
labgrid/protocol/commandprotocol.py	100% <100%> (ø)	⬆️
labgrid/driver/commandmixin.py	58.9% <21.4%> (-21.1%)	⬇️

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[nefethael]

I removed try catch as it was useless.

[Emantor]

Changes look good, however we are still missing documentation for this feature.

No Documentation provided

[jluebbe]

Looks good, but needs documentation at least for the parameters.

[Emantor]

The documentation strings have been updated by me, please review again so we can get this merged.

[Emantor]

@jluebbe please take a look at this again, should be ready to go.

[jluebbe]

I've fixed the return values and rebased the changes.

[Emantor]

I rebased again and resolved the conflicts, I'll wait for a CI run and than merge.