Enable multiple controllers

[style95]

Description

This is to enable multiple controllers on CI tests.
I think it is supposed to be enabled but it was commented at some point.

Related issue and scope

• I opened an issue to propose and discuss this change (Question : Controllers standby test  #5416)

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

All modified and coverable lines are covered by tests ✅

Comparison is base (e20ab17) 76.85% compared to head (2dd6d81) 76.75%.

❗ Current head 2dd6d81 differs from pull request most recent head daf191a. Consider uploading reports for the commit daf191a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5420      +/-   ##
==========================================
- Coverage   76.85%   76.75%   -0.11%     
==========================================
  Files         241      241              
  Lines       14649    14649              
  Branches      629      629              
==========================================
- Hits        11259    11244      -15     
- Misses       3390     3405      +15     

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[style95]

This is to enable the second controller in the CI environment to run the HA test for controllers.

[style95]

@ningyougang
It's ready to merge.