add information about what the possible auth_system values mean.
add information about what the possible auth_system values mean.

torkelsson/ganglia-web,ganglia/ganglia-web,ganglia/ganglia-web,akkakks/ganglia-web,ganglia/ganglia-web,akkakks/ganglia-web,luckypoem/ganglia-web,ganglia/ganglia-web,torkelsson/ganglia-web,ganglia/ganglia-web,torkelsson/ganglia-web,akkakks/ganglia-web,torkelsson/ganglia-web,luckypoem/ganglia-web,luckypoem/ganglia-web,akkakks/ganglia-web,akkakks/ganglia-web,luckypoem/ganglia-web,torkelsson/ganglia-web,luckypoem/ganglia-web