remove remaining uses of /api in the rest namespace

[artlowel]

References

• Addresses a comment in #826
• Rest namespaces ending in /api were deprecated by Add robots.txt #825

Description

This PR removes /api from the rest namespaces of environment.common.ts and .travis.yml, as it was deprecated in #825

Instructions for Reviewers

• Test this PR by verifying the travis build works, and that the build logs don't show the deprecation warning.
• Test that if you don't override the rest namespace in your local environment files, you don't get the deprecation warning when building.

If you notice any other uses of /api I've forgotten please let me know.

Checklist

• My PR is small in size (e.g. less than 1,000 lines of code, not including comments & specs/tests), or I have provided reasons as to why that's not possible.
• My PR passes TSLint validation using yarn run lint
• My PR includes TypeDoc comments for all new (or modified) public methods and classes. It also includes TypeDoc for large or complex private methods.
• My PR passes all specs/tests and includes new/updated specs or tests based on the Code Testing Guide.
• If my PR includes new, third-party dependencies (in package.json), I've made sure their licenses align with the DSpace BSD License based on the Licensing of Contributions documentation.

[tdonohue]

@artlowel : This looks good at a glance... though I see three more places where /api needs cleanup:

• In our template: https://github.com/DSpace/dspace-angular/blob/main/src/environments/environment.template.ts#L7
• In our Docker dev configs: https://github.com/DSpace/dspace-angular/blob/main/docker/environment.dev.ts#L16
• In our docs (it appears two places in this section of the Config docs): https://github.com/DSpace/dspace-angular/blob/main/docs/Configuration.md#dspaces-rest-endpoint

So, if we could add those, then I think this would be ready to go.

[tdonohue]

👍 Looks correct to me. I also gave this some light testing and noticed no issues (and the warning has disappeared as expected).

[mwoodiupui]

+1 by inspection. Looks right.