Import fixes

[Bastian-Krause]

Description

• drop unused imports
• fix import order

Checklist

• PR has been tested

[codecov]

Codecov Report

Merging #883 (cc1bb2a) into master (46e4333) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master    #883     +/-   ##
========================================
- Coverage    56.9%   56.9%   -0.1%     
========================================
  Files         149     149             
  Lines       11013   11011      -2     
========================================
- Hits         6270    6268      -2     
  Misses       4743    4743             

Impacted Files	Coverage Δ
labgrid/driver/shelldriver.py	28.0% <ø> (-0.3%)	⬇️
labgrid/remote/client.py	44.6% <ø> (-0.1%)	⬇️
labgrid/driver/httpvideodriver.py	56.0% <100.0%> (ø)

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