Add an I-issue-report label to issue reports

[asajeffrey]

browserhtml/browserhtml#1152 adds an identifying string This report was generated by the browser.html issue reporter. to issue reports it generates. Highfive could use this information, for example to add an I-issue-report label to the issue.

[highfive]

Please make a comment here if you intend to work on this issue. Thank you!

[highfive]

cc @jdm

[asajeffrey]

Over in IRC (http://logs.glob.uno/?c=mozilla%23servo&s=1+Jul+2016&e=1+Jul+2016#c470789) @aneeshusa says this should be E-Easy.

[jdm]

This belongs in a new handler in handlers which looks at the body of the issue and adds the label if necessary.

[cbrewster]

Should we also add the I-panic tag? As these issue reports are only generated when a panic occurs?

[jdm]

This will be a bit more work than originally anticipated, because we don't have any handlers that deal with opening new issues. We'll want to make the created event map to either on_new_pr or on_new_issue based on whether the pull_request field exists in the payload['issue'] object (see eventhandler.py).

[jdm]

Yes, adding the panic tag would also be useful.

[asajeffrey]

At some point we may be getting error reports that aren't panics, but we can cross that bridge when we come to it.