Missed config keys on Scala 2.13.x

[YevSent]

Desscription

The origin of issue is iteration through the config keys here and here and at the same time properties change in the loop which can lead to skipping some keys after +=.

• Fixed an issue with missed config keys while iterating through them on Scala 2.13.x

!Note: This issue reproduces only on Scala >= 2.13.x version and probably related to some internal changes in Scala.

Related issue and scope

• Missed config keys on Scala 2.13.x #5447

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Scheduler
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).

Checklist:

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[codecov-commenter]

Codecov Report

Merging #5440 (1558e79) into master (20f7d98) will decrease coverage by 0.29%.
Report is 3 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head 1558e79 differs from pull request most recent head 10c1cae. Consider uploading reports for the commit 10c1cae to get more accurate results

@@            Coverage Diff             @@
##           master    #5440      +/-   ##
==========================================
- Coverage   76.82%   76.54%   -0.29%     
==========================================
  Files         241      241              
  Lines       14632    14634       +2     
  Branches      616      627      +11     
==========================================
- Hits        11241    11201      -40     
- Misses       3391     3433      +42     

Files	Coverage Δ
...ain/scala/org/apache/openwhisk/common/Config.scala	85.29% <100.00%> (+0.91%)	⬆️

... and 12 files with indirect coverage changes

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