These used ipautil.get_ipa_basedn. Convert that to use the new wrappers.
Beef up the error handling in ipaldap to accomodate the errors we catch
in the server discovery.
Add a DatabaseTimeout exception to errors.py.
These were the last uses of ipautil.convert_ldap_error, remove that.
https://fedorahosted.org/freeipa/ticket/3487https://fedorahosted.org/freeipa/ticket/3446