Add retry to store activations.

[style95]

Description

Sometimes, the system fails to store activations for intermittent errors such as network rupture.
It would be great to retry storing them in such a case.

Related issue and scope

• I opened an issue to propose and discuss this change (#????)

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).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

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 #5277 (3a5c381) into master (639c4a9) will decrease coverage by 17.00%.
The diff coverage is 37.50%.

@@             Coverage Diff             @@
##           master    #5277       +/-   ##
===========================================
- Coverage   80.07%   63.07%   -17.01%     
===========================================
  Files         238      238               
  Lines       14084    14101       +17     
  Branches      588      575       -13     
===========================================
- Hits        11278     8894     -2384     
- Misses       2806     5207     +2401     

Impacted Files	Coverage Δ
...che/openwhisk/core/database/CouchDbRestStore.scala	69.60% <33.33%> (-1.61%)	⬇️
...e/elasticsearch/ElasticSearchActivationStore.scala	77.34% <35.71%> (-4.42%)	⬇️
...a/org/apache/openwhisk/core/database/Batcher.scala	95.00% <100.00%> (ø)
...che/openwhisk/core/invoker/LogStoreCollector.scala	0.00% <0.00%> (-100.00%)	⬇️
...nwhisk/core/scheduler/queue/ContainerCounter.scala	0.00% <0.00%> (-100.00%)	⬇️
...hisk/core/scheduler/message/ContainerMessage.scala	0.00% <0.00%> (-100.00%)	⬇️
...core/database/cosmosdb/RxObservableImplicits.scala	0.00% <0.00%> (-100.00%)	⬇️
...ore/database/cosmosdb/cache/CacheInvalidator.scala	0.00% <0.00%> (-100.00%)	⬇️
...e/database/cosmosdb/cache/ChangeFeedConsumer.scala	0.00% <0.00%> (-100.00%)	⬇️
...core/scheduler/queue/SchedulingDecisionMaker.scala	0.00% <0.00%> (-98.80%)	⬇️
... and 64 more

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