Detect and log CAPTCHA challenges

[gustavkarlsson]

If CAPTCHA is enabled on the JIRA server, it might respond with a 403 message that looks like this:

These messages should be logged (ERROR level?) to clearly convey that a manual CAPTCHA verification is required.

[gustavkarlsson]

Essentially this boils down to:

If any call to the JIRA API responds with status code 403, check if the header X-Authentication-Denied-Reason contains CAPTCHA_CHALLENGE. If so, throw an appropriate exception instructing the user to re-login using the browser.