1145734 - more correct error message when apache fails

[BZ-1145734](https://bugzilla.redhat.com/show_bug.cgi?id=1145734) 

Suggesting that the user should run `pulp-manage-db` is often accurate but it can be a confusing message if the error is unrelated. New message provides context so the user will know if they need to run `pulp-manage-db`.