Patch by Max Kanat-Alexander <mkanat@kerio.com>   r=vladd  a=justdave

patch by erik
r=joel, kiko
a=myk

patch by erik
r=joel
a=justdave

r= gerv, a= justdave

1). Factored code out from Bugzilla::Auth::DB->authenticate() into
separate methods so we can use them externally. Add extra API to DB.pm,
which is currently used only internally (pending part 2). r=bbaetz, a=justdave

r= bbaetz, a= justdave

patch by 'Randall M! Gee', r=bbaetz, a=justdave

r=gerv, justdave
a=justdave