change conductor root path and swagger ui not work

[dingliu1]

Describe the bug
Change conductor root path and swagger ui html not work

Details
Conductor version:
Persistence implementation: Cassandra, Postgres, MySQL, Dynomite etc - Postgres
Queue implementation: Postgres, MySQL, Dynoqueues etc
Lock: Redis or Zookeeper?
Workflow definition:
Task definition:
Event handler definition:

As part of Netflix/conductor#3656 conductor support customize web app root by change homepage, however it seems this change miss swagger doc

To Reproduce
Steps to reproduce the behavior:

1. Go to 'ui/package.json', add one line - "homepage": "https://somedomain/conductor/"
2. Build the image and deploy
3. Access "https://somedomain/conductor/swagger-ui/index.html", the page show "failed to load remote configuration"
4. After investigate, swagger-ui/swagger-initializer.js the "configUrl" : "/api-docs/swagger-config" use absolute address

Expected behavior
Swagger ui should work when customize root is configured. Can you do same change like issue 3656
Screenshots
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Additional context
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