Set default auth_strategy to keystone

It doesn't make much sense to default to no authentication in
production. We should always have production ready defaults.

DocImpact Changing default config option.

Change-Id: Ife63dc7ab680fcf0588d95c98fc9f29901485c64
Fix typo in unit tests

A couple of unit tests misspelt 'factory'.

Fixes bug 1312776

Change-Id: I1c3a7ba63671aff4d866d0501c941ce637238546
Merge "Fix typo in unit tests"
Merge "Set default auth_strategy to keystone"