Add USB reset to ZWO camera class on exposure failed

[danjampro]

ZWO cameras occasionally throw exposure failed errors and become unresponsive until they are reset. At the moment, that is achieved by rebooting the whole system.

How Has This Been Tested?

Hardware tests.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[codecov]

Codecov Report

Merging #1079 (985779c) into develop (7b33006) will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1079      +/-   ##
===========================================
+ Coverage    86.46%   86.51%   +0.04%     
===========================================
  Files           80       80              
  Lines         6725     6725              
  Branches       578      578              
===========================================
+ Hits          5815     5818       +3     
+ Misses         742      740       -2     
+ Partials       168      167       -1     

Impacted Files	Coverage Δ
src/panoptes/pocs/camera/camera.py	84.96% <0.00%> (+0.68%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7b33006...5d0da24. Read the comment docs.