[AS7-6108] By default disable the acceptance of empty passwords from remote users attempting to authenticate.

Also added a new option 'allow-empty-passwords' on the LDAP authentication definition so that users that do have a valid use for empty passwords can reverse the change.
[AS7-6182] Upgrade slf4j and slf4j components to work with 1.7.2
Upgrade to MSC 1.0.4.GA