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Attempt session init x times before failing. Success is detemined by req.session !== undefined.
Heavily inspired by https://github.com/expressjs/session/issues/99#issuecomment-63853989.
Params
session_retry(session_middleware, [tries]).
tries is optional, defaults to 3.
Example of usage
var session_middleware = session({});
app.use(require('./session_retry')(session_middleware, 3));