fix authentication failure

fix authentication failure

Ensure that the auth_limit values are read when open-ils.auth
initializes, not during oilsAuthInit().  This solves a problem
observed on brick-based setups where authentication could
incorrectly fail because the drone that processes
open-ils.auth.authenticate.complete didn't have the the block
count value initialized yet.

Also fixed type nit when compare the fail count to the block
limit.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>