Update/update role use user token

[leogermani]

This PR changes the token used to hit the jetpack.updateRole. It used to use the "Master user" token and now uses the current user token. It assumes that the user changing the role must have the proper capabilities to do so.

Changes proposed in this Pull Request:

• jetpack.updateRole now uses the current user token

Jetpack product discussion

p9dueE-1Dv-p2#comment-2838

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• Set up a connected Jetpack site
• Create a second user and authorize it to a different WordPress.com account
• Back to the first administrator, edit the second user and change its role
• Check the WPCOM database to see if the change was applied. See 25ef5-pb/#plain

Proposed changelog entry for your changes:

• • jetpack.updateRole now uses the current user token

[jetpackbot]

Thank you for the great PR description!

When this PR is ready for review, please apply the [Status] Needs Review label. If you are an a11n, please have someone from your team review the code if possible. The Jetpack team will also review this PR and merge it to be included in the next Jetpack release.

E2E results is available here (for debugging purposes): https://jetpack-e2e-dashboard.herokuapp.com/pr-16710

Scheduled Jetpack release: September 1, 2020.
Scheduled code freeze: August 25, 2020

Generated by 🚫 dangerJS against c4b3a0e

[fgiannar]

Hi @leogermani ,

Tested this and works as expected 👍