Sort LDAP updates properly
LDAP updates were sorted by number of RDNs in DN. This, however,
sometimes caused updates to be executed before cn=schema updates.
If the update required an objectClass or attributeType added during
the cn=schema update, the update operation failed.
Fix the sorting so that the cn=schema updates are always run first
and then the other updates sorted by RDN count.
https://fedorahosted.org/freeipa/ticket/3342