#SB-260: Make it possible to configure the LDAP settings over REST

- Implemented a Restlet for the LDAP configuration.
- Implemented a REST client for the LDAP configuration.
#SB-261: Create a service for managing the AD settings

Implemented.

#SB-262: Make it possible to configure the AD settings over REST

Implemented.
- Extracted the LDAP configuration classes into their own package.
- Renamed some of the service methods appropriately.