chore: Unify internal service host config names

[arajkumar]

Prior to this PR, service config values are spread across two variables, host-name & port. This is less flexible because you can't override the scheme.(e.g. http to https).

Also no option to override individual insight service ports. e.g. useful while running on docker-compose.

This PR unifies all service host base url under the following pattern(*_base_url).
e.g.

PYPI_INSIGHTS_BASE_URL=http://f8a-pypi-insights:6006

Note: There is no functionality affected.

[arajkumar]

/build-image

[github-actions]

🧪 CI has Started Image Build

[github-actions]

✌️ Image Build Successfull @arajkumar, Avaliable at: ghcr.io/fabric8-analytics/f8a-server-backbone/fabric8-analytics-f8a-server-backbone:SNAPSHOT-PR-269

[codecov-io]

Codecov Report

Merging #269 (4cbe322) into master (b66e25e) will increase coverage by 1.95%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
+ Coverage   91.75%   93.71%   +1.95%     
==========================================
  Files          11        8       -3     
  Lines        1577      938     -639     
==========================================
- Hits         1447      879     -568     
+ Misses        130       59      -71     

Impacted Files	Coverage Δ
src/rest_api.py	88.46% <100.00%> (ø)
src/settings.py	100.00% <100.00%> (ø)
src/utils.py	85.36% <100.00%> (-1.53%)	⬇️
src/v2/license_service.py	96.29% <100.00%> (+0.04%)	⬆️
src/v2/recommender.py	100.00% <100.00%> (ø)
src/v2/stack_aggregator.py	93.13% <100.00%> (+0.63%)	⬆️
src/__init__.py

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[dgpatelgit]

lgtm

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.68%. Comparing base (b66e25e) to head (34902af).
⚠️ Report is 28 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
+ Coverage   91.75%   93.68%   +1.93%     
==========================================
  Files          11        8       -3     
  Lines        1577      935     -642     
==========================================
- Hits         1447      876     -571     
+ Misses        130       59      -71     

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