deprecate app-ssl flag in cli

[mukundansundar]

Description

No changes needed in CLI to maintain backwards compatibility, runtime change maintains backwards compatibility.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1267

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [x] Code compiles correctly
• [ ] Created/updated tests
• [ ] Extended the documentation

[codecov[bot]]

Codecov Report

Merging #1269 (ce0a571) into master (756b541) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1269   +/-   ##
=======================================
  Coverage   27.26%   27.26%           
=======================================
  Files          38       38           
  Lines        3715     3715           
=======================================
  Hits         1013     1013           
  Misses       2635     2635           
  Partials       67       67           

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