Bump ephemeral couchdb to v2.3

[jonpspri]

Bump the ephemeral CouchDB version to 2.3. Version 2.1 apache image (in current use) fails when mounting external data storage file systems set up with different uids than the docker daemon.

Description

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
• 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.

[rabbah]

@jonpspri not sure if #4250 is related - do you mind taking a look?

[codecov-io]

Codecov Report

Merging #4202 into master will decrease coverage by 7.92%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4202      +/-   ##
==========================================
- Coverage   86.21%   78.28%   -7.93%     
==========================================
  Files         152      156       +4     
  Lines        7275     8314    +1039     
  Branches      477      561      +84     
==========================================
+ Hits         6272     6509     +237     
- Misses       1003     1805     +802

Impacted Files	Coverage Δ
...core/database/cosmosdb/RxObservableImplicits.scala	0% <0%> (-100%)	⬇️
...n/scala/org/apache/openwhisk/common/CausedBy.scala	0% <0%> (-100%)	⬇️
...core/database/cosmosdb/CosmosDBArtifactStore.scala	0% <0%> (-95.54%)	⬇️
...sk/core/database/cosmosdb/CosmosDBViewMapper.scala	0% <0%> (-92.6%)	⬇️
...whisk/core/database/cosmosdb/CosmosDBSupport.scala	0% <0%> (-83.34%)	⬇️
...abase/cosmosdb/CosmosDBArtifactStoreProvider.scala	0% <0%> (-62.5%)	⬇️
...penwhisk/core/database/cosmosdb/CosmosDBUtil.scala	57.5% <0%> (-38.5%)	⬇️
...apache/openwhisk/core/database/LimitsCommand.scala	63.82% <0%> (-34.54%)	⬇️
...containerpool/kubernetes/KubernetesContainer.scala	64.28% <0%> (-30.46%)	⬇️
.../containerpool/ApacheBlockingContainerClient.scala	48.14% <0%> (-22.77%)	⬇️
... and 29 more

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