The main point of this work is to move runFilteredPathsEvaluation inside mountInternal/enableCredentialInternal, while we hold the lock. This requires that we grab both the mountsLock and authLock, for reasons that only make sense when looking at the ent code.
While fixing this I noticed that ListAuths grabs the wrong lock, so I also fixed that.
And I modified ClusterSetup: as a convenience, it now populates the factories for all the builtin engines in the config it returns.
c5549cdac6