Add fpc pool balancer

[style95]

Description

This is to add FPCPoolBalancer
I opened a new PR to see if there is any difference in the Travis CI environment.
Old one: #5158

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 #5191 (5e479a3) into master (9633043) will increase coverage by 29.04%.
The diff coverage is 34.58%.

@@             Coverage Diff             @@
##           master    #5191       +/-   ##
===========================================
+ Coverage   45.50%   74.54%   +29.04%     
===========================================
  Files         234      235        +1     
  Lines       13389    13654      +265     
  Branches      551      545        -6     
===========================================
+ Hits         6092    10179     +4087     
+ Misses       7297     3475     -3822     

Impacted Files	Coverage Δ
...rg/apache/openwhisk/common/AverageRingBuffer.scala	27.27% <ø> (ø)
...che/openwhisk/core/loadBalancer/LoadBalancer.scala	81.81% <0.00%> (+81.81%)	⬆️
...e/loadBalancer/ShardingContainerPoolBalancer.scala	78.53% <ø> (+78.53%)	⬆️
...e/openwhisk/core/scheduler/queue/MemoryQueue.scala	83.73% <ø> (ø)
.../openwhisk/core/loadBalancer/FPCPoolBalancer.scala	33.06% <33.06%> (ø)
...enwhisk/core/loadBalancer/CommonLoadBalancer.scala	71.42% <64.28%> (+71.42%)	⬆️
...whisk/connector/kafka/KafkaProducerConnector.scala	60.00% <0.00%> (-27.50%)	⬇️
...nwhisk/core/scheduler/queue/ContainerCounter.scala	84.21% <0.00%> (-7.90%)	⬇️
...pache/openwhisk/core/containerpool/Container.scala	89.65% <0.00%> (-1.15%)	⬇️
...ntainerpool/v2/FunctionPullingContainerProxy.scala	78.12% <0.00%> (+0.34%)	⬆️
... and 136 more

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[style95]

superseded by #5192