do in-app compression only for CLI

[bkmartinjr]

In-app compression of HTTP responses is now enabled only for the CLI, which uses the flask dev HTTP server. When being launched as a WSGI server, no compression is done on the assumption that it will be handled by the httpd.

Also deleted old dead code related to an unused HTTP response caching module.

[codecov-io]

Codecov Report

Merging #1285 into master will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1285      +/-   ##
==========================================
- Coverage   62.41%   62.39%   -0.03%     
==========================================
  Files          66       66              
  Lines        4920     4922       +2     
  Branches      374      374              
==========================================
  Hits         3071     3071              
- Misses       1757     1759       +2     
  Partials       92       92              

Flag	Coverage Δ
#backend	52.06% <0.00%> (-0.04%)	⬇️
#frontend	75.00% <ø> (ø)
#javascript	75.00% <ø> (ø)
#python	52.06% <0.00%> (-0.04%)	⬇️
#smokeTest	100.00% <ø> (ø)
#smokeTestAnnotations	100.00% <ø> (ø)
#unitTest	62.39% <0.00%> (-0.03%)	⬇️

Impacted Files	Coverage Δ
server/app/app.py	0.00% <ø> (ø)
server/cli/launch.py	0.00% <0.00%> (ø)

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[bmccandless]

LGTM