Create drush commands to add and remove alerts.

Posting the static patch because using the MR doesn't allow pinning to a specific commit, so anyone can submit pretty much anything and inject it into our codebase IIRC. Rerolled for 2.1. This also fixed our issue.

I messed up the above patch. Here's the correct one.

Attesting that the proposed feature works as intended. However, I've experienced issues running the supplied functional tests for the patch--in one case, I got a "service 'lock' has a dependency on a non-existent service 'memcache.lock.factory'". And in another, "class 'Drupal\Tests\BrowserTestCase' not found" occurred. This may be due to my ignorance or possibly other factors. The patch works fine for my requirements, although I'd encourage others to review and share their experience.

I had to update the patch to add an accessCheck() to the query for the getAlertsByLabel method. Missed that!

And missed one change for the patch.

Thank you Chris for getting this across the finish line.

Automatically closed - issue fixed for 2 weeks with no activity.