fix(test): Remove the inter-test dependencies in the reset-password tests.

fixes #1831
maybe fixes #1834
fixes #1835
Add `initiateResetPassword` to programatically initiate a reset password.
Merge pull request #1911 from mozilla/issue-1831-reset-password-tangle

fix(test): Remove the inter-test dependencies in the reset-password tests.

DRY updates made, @zaach gives the r+, merging.

Thanks for reviewing @zaach!