[New Scheduler] Update main method of the scheduler.

[style95]

Description

This is to update the main method of the scheduler.

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 #5157 (9ee0b27) into master (cf36299) will increase coverage by 29.18%.
The diff coverage is 1.69%.

@@             Coverage Diff             @@
##           master    #5157       +/-   ##
===========================================
+ Coverage   45.68%   74.86%   +29.18%     
===========================================
  Files         234      234               
  Lines       13382    13429       +47     
  Branches      541      551       +10     
===========================================
+ Hits         6113    10054     +3941     
+ Misses       7269     3375     -3894     

Impacted Files	Coverage Δ
...rg/apache/openwhisk/common/AverageRingBuffer.scala	27.27% <ø> (ø)
...rg/apache/openwhisk/core/scheduler/Scheduler.scala	5.92% <0.00%> (-2.66%)	⬇️
...e/openwhisk/core/scheduler/queue/MemoryQueue.scala	83.73% <ø> (ø)
.../core/scheduler/container/CreationJobManager.scala	83.33% <100.00%> (ø)
...pache/openwhisk/core/invoker/InvokerReactive.scala	59.48% <0.00%> (-18.97%)	⬇️
...whisk/connector/kafka/KafkaProducerConnector.scala	80.00% <0.00%> (-7.50%)	⬇️
...whisk/connector/kafka/KafkaConsumerConnector.scala	81.69% <0.00%> (-5.64%)	⬇️
...pache/openwhisk/core/containerpool/Container.scala	89.65% <0.00%> (-1.15%)	⬇️
...e/openwhisk/core/containerpool/ContainerPool.scala	96.86% <0.00%> (+1.56%)	⬆️
.../org/apache/openwhisk/core/entity/EntityPath.scala	100.00% <0.00%> (+1.88%)	⬆️
... and 130 more

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[bdoyle0182]

LGTM