Add couchdb conf dir

[style95]

Description

This is to persist configurations for CouchDB.
The configuration directory is configurable.

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.

[style95]

These default files are from the apache/couchdb:2.3 image.

[style95]

The erlang cookie is configurable with this.

[style95]

I am testing the various clustering scenario with this version.

[style95]

I have tested the followings.

1. Deploy a CouchDB cluster with 3 nodes.
2. Restart one of the nodes.
3. Stop all nodes and start them again.
4. Deploy a new cluster with 2 nodes and add another node by running the ansible script again with --limit db[2:2] option.

In all cases, a cluster was made, the cluster was stable after the restart, and a new node successfully joined the existing cluster.

[codecov-commenter]

Codecov Report

Merging #5285 (e32be04) into master (1fbfd6b) will decrease coverage by 75.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #5285       +/-   ##
==========================================
- Coverage   79.81%   4.57%   -75.24%     
==========================================
  Files         238     238               
  Lines       14154   14154               
  Branches      607     607               
==========================================
- Hits        11297     648    -10649     
- Misses       2857   13506    +10649     

Impacted Files	Coverage Δ
.../main/scala/org/apache/openwhisk/core/WarmUp.scala	0.00% <0.00%> (-100.00%)	⬇️
...ain/scala/org/apache/openwhisk/spi/SpiLoader.scala	0.00% <0.00%> (-100.00%)	⬇️
...n/scala/org/apache/openwhisk/utils/JsHelpers.scala	0.00% <0.00%> (-100.00%)	⬇️
...scala/org/apache/openwhisk/common/Prometheus.scala	0.00% <0.00%> (-100.00%)	⬇️
...scala/org/apache/openwhisk/core/FeatureFlags.scala	0.00% <0.00%> (-100.00%)	⬇️
...ala/org/apache/openwhisk/common/ConfigMXBean.scala	0.00% <0.00%> (-100.00%)	⬇️
...la/org/apache/openwhisk/http/BasicRasService.scala	0.00% <0.00%> (-100.00%)	⬇️
...a/org/apache/openwhisk/common/ConfigMapValue.scala	0.00% <0.00%> (-100.00%)	⬇️
...a/org/apache/openwhisk/core/entity/WhiskAuth.scala	0.00% <0.00%> (-100.00%)	⬇️
.../org/apache/openwhisk/core/entity/EntityPath.scala	0.00% <0.00%> (-100.00%)	⬇️
... and 201 more

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[style95]

The CouchDB node keeps restarting in Travis.
It complains about the permission of configuration files.
Have no idea how to solve this so far.