take swagger-ui host from custom.conf

[bingzhang]

Description

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the CHANGELOG.md.
• I have signed the CLA
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[bingzhang]

I tested the custom.conf fix in my local. it works.

I did not test the docker env fix. and I will test it later.

[bingzhang]

I tested the custom.conf fix in my local. it works.

I did not test the docker env fix. and I will test it later.

I did the docker test at UIUC vm. with the ENV setting SWAGGER_UI_HOST=YourSwaggerUIHost, it will use the swagger ui to show the swagger doc. Otherwise, it will use the default https://clowder.ncsa.illinois.edu/swagger endpoint to show the doc.