If the jira object cannot connect to jira it will
try a re-connect after a period of time.
This could lead to a timeout in a long running RB process
of a WSGI server (like uwsgi).
Let's disable internal retry of the jira class and let
Review Board handle that.

Error of jira class:
Got recoverable error from GET https://jira.company.de/rest/api/2/issue/PROJECT-123, will retry [1/3] in 19.0767479194s. Err: 401

Added the fix and saw that it fails immediately and don't block any process.