Docker Updates

[wtgee]

• Remove anaconda, switch to python:3.8-slim-buster for base image.
• Simplified docker files.
• Travis builds docker image before testing.
• Travis doesn't upload coverage.
• Don't update module inside container during entrypoint.
• User permissions for $HOME and $PANDIR.
• Remove GCP Cloud SQL proxy support.

[codecov-io]

Codecov Report

Merging #155 into develop will increase coverage by 0.17%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #155      +/-   ##
===========================================
+ Coverage    70.15%   70.32%   +0.17%     
===========================================
  Files           26       26              
  Lines         1712     1722      +10     
  Branches       226      226              
===========================================
+ Hits          1201     1211      +10     
  Misses         456      456              
  Partials        55       55

Impacted Files	Coverage Δ
panoptes/utils/database/memory.py	98.5% <0%> (+0.02%)	:arrow_up:
panoptes/utils/database/file.py	95.94% <0%> (+0.05%)	:arrow_up:
panoptes/utils/theskyx.py	91.83% <0%> (+0.17%)	:arrow_up:
panoptes/utils/database/__init__.py	90.19% <0%> (+0.19%)	:arrow_up:
panoptes/utils/rs232.py	86.6% <0%> (+0.24%)	:arrow_up:
panoptes/utils/messaging.py	57.69% <0%> (+0.41%)	:arrow_up:
panoptes/utils/config/server.py	44.73% <0%> (+2.27%)	:arrow_up:

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