Fix #1740: Handle OPTIONS in management API

[xyang16]

Description

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Please include a summary of the feature or issue being fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

This is to fix #1740.

The cause is that the browser (tested Firefox, Chrome and Safari) was using OPTIONS to do a preflight check before PUT and DELETE request.

TS code currently doesn't handle OPTIONS for management API and will throw MethodNotAllowedException.

Fixes #1740

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Feature/Issue validation/testing

Please describe the Unit or Integration tests that you ran to verify your changes and relevant result summary. Provide instructions so it can be reproduced.
Please also list any relevant details for your test configuration.

• Test A
  Logs for Test A

Before the fix the CORS DELETE / PUT requests failed with:

CORS Preflight Did Not Succeed

After the fix the CORS requests succeeded.

• Test B
  Logs for Test B

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

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[lxning]

listManagementApis can be applied here.

[xyang16]

listManagementApis has 6 paths:

/
/models
/models/{model_name}
/models/{model_name}/{model_version}
/models/{model_name}/{model_version}/set-default
/api-description

Here because it's only listing for specific model, it has only 3 paths:

/models/{model_name}
/models/{model_name}/{model_version}
/models/{model_name}/{model_version}/set-default

[maaquib]

Please add a unit test case as well

[xyang16]

Please add a unit test case as well

Hi Aaqib, I have added unit tests.