Misc small changes - docker, testing, logging

[wtgee]

Some minor changes to a few areas. Mostly trying to make log output smoother for testing.

Description

• Adding PYTHONUNBUFFERED to env vars in Dockerfile so logs will output immediately.
• Removing version and deploy from docker compose files.
• log_dir is an optional requirement. If not passed then no log files will be created. Requires log directory to exist otherwise log files won't be written.

[codecov[bot]]

Codecov Report

Merging #1145 (902a314) into develop (713e08d) will increase coverage by 0.28%. The diff coverage is 61.05%.

@@             Coverage Diff             @@
##           develop    #1145      +/-   ##
===========================================
+ Coverage    83.22%   83.51%   +0.28%     
===========================================
  Files           82       86       +4     
  Lines         7040     7364     +324     
  Branches       608      628      +20     
===========================================
+ Hits          5859     6150     +291     
- Misses        1011     1042      +31     
- Partials       170      172       +2     

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)
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:
src/panoptes/pocs/utils/cli/config.py	52.17% <52.17%> (ø)
... and 31 more

---

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 2341ba6...902a314. Read the comment docs.