Use `self._driver` in `SDKCamera` instances

[danjampro]

SDK camera subclasses are currently very hard / impossible to override cleanly because of problems with the driver. This is because Camera (the class name) is directly referenced in instance methods, which should be using self instead.

Types of changes

• [x] 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[bot]]

Codecov Report

Merging #1140 (33a02d4) into develop (713e08d) will increase coverage by 0.18%. The diff coverage is 59.20%.

@@             Coverage Diff             @@
##           develop    #1140      +/-   ##
===========================================
+ Coverage    83.22%   83.40%   +0.18%     
===========================================
  Files           82       86       +4     
  Lines         7040     7358     +318     
  Branches       608      627      +19     
===========================================
+ Hits          5859     6137     +278     
- Misses        1011     1048      +37     
- Partials       170      173       +3     

Impacted Files	Coverage Δ
src/panoptes/pocs/camera/gphoto/base.py	100.00% <ø> (ø)
src/panoptes/pocs/sensor/remote.py	85.00% <ø> (ø)
src/panoptes/pocs/utils/logger.py	100.00% <ø> (ø)
tests/scheduler/test_base_scheduler.py	100.00% <ø> (ø)
tests/scheduler/test_dispatch_scheduler.py	94.11% <ø> (ø)
src/panoptes/pocs/mount/ioptron/ieq30pro.py	19.49% <5.88%> (+0.68%)	:arrow_up:
src/panoptes/pocs/focuser/astromechanics.py	32.14% <25.00%> (+5.02%)	:arrow_up:
src/panoptes/pocs/focuser/serial.py	46.93% <30.76%> (+23.12%)	:arrow_up:
src/panoptes/pocs/sensor/power.py	41.97% <39.53%> (ø)
src/panoptes/pocs/mount/ioptron/cem40.py	40.34% <44.24%> (+13.14%)	:arrow_up:
... and 27 more

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