Use bigger queue size

[style95]

Handle #5452

Description

When sending concurrent requests, a queue full error happens.
So I increased the queue size according to this value in the nodejs runtime repo.

Related issue and scope

• I opened an issue to propose and discuss this change (AkkaContainerClient breaks the ConcurrentTests of nodejs runtime #5452)

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]

I confirmed this change fix the CI tests of nodejs runtime.

[style95]

@joni-jones
Could you take a look?

[codecov-commenter]

Codecov Report

Merging #5453 (168735d) into master (a4f4b2d) will increase coverage by 0.00%.
The diff coverage is 50.00%.

❗ Current head 168735d differs from pull request most recent head a739454. Consider uploading reports for the commit a739454 to get more accurate results

@@           Coverage Diff           @@
##           master    #5453   +/-   ##
=======================================
  Coverage   76.52%   76.53%           
=======================================
  Files         241      241           
  Lines       14644    14645    +1     
  Branches      619      609   -10     
=======================================
+ Hits        11206    11208    +2     
+ Misses       3438     3437    -1     

Files	Coverage Δ
...whisk/core/containerpool/AkkaContainerClient.scala	71.69% <50.00%> (+0.54%)	⬆️

... and 5 files with indirect coverage changes

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[joni-jones]

I see that the default value for max-connections is 128. So the queue might consume slightly more memory, but it should not have any impact. Overall, I think this fix makes sense.

[dgrove-oss]

lgtm. Merging.