App Settings Logs formatting fixes

[hallvictoria]

Description

Added space and delimiter for parsing. Logs now look like below:

Fixes https://github.com/Azure/azure-functions-pyfx-planning/issues/99

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PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and CI is passing.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0337cb7) 85.93% compared to head (6394974) 85.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1387      +/-   ##
==========================================
- Coverage   85.93%   85.11%   -0.82%     
==========================================
  Files          35       35              
  Lines        1955     1955              
  Branches      370      370              
==========================================
- Hits         1680     1664      -16     
- Misses        207      217      +10     
- Partials       68       74       +6     

Flag	Coverage Δ
unittests	85.06% <ø> (-0.82%)	⬇️

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[vrdmr]

Thanks a lot for doing this! :)

LGTM