Handle authentication failures when accessing /api/info/.
Handle authentication failures when accessing /api/info/.

When accessing a password-protected /api/info/ path, we wouldn't gracefully
handle an invalid login. Instead, we would fall back on the old, deprecated
API. This would always fail on RB 1.6, making things very confusing. Now we
handle this better and just simply bail if we can't log in the first time.

beol/rbtools,halvorlu/rbtools,datjwu/rbtools,davidt/rbtools,haosdent/rbtools,datjwu/rbtools,davidt/rbtools,bcelary/rbtools,beol/rbtools,Khan/rbtools,1tush/rbtools,clach04/rbtools_0.4.1,reviewboard/rbtools,Khan/rbtools,datjwu/rbtools,haosdent/rbtools,reviewboard/rbtools,halvorlu/rbtools,clach04/rbtools,beol/rbtools,haosdent/rbtools,reviewboard/rbtools,davidt/rbtools,halvorlu/rbtools