@Override
  protected AmbariLdapConfiguration loadInstance(Collection<AmbariConfigurationEntity> configurationEntities) {
    return new AmbariLdapConfiguration(toProperties(configurationEntities));
  }
Provider implementation for LDAP configurations.
It needs to be registered in the related GUICE module as a provider.
It's responsible for managing LDAP configurations in the application.
Whenever requested, this provider returns an AmbariLdapConfiguration which is always in sync with the persisted LDAP
configuration resource.
<p>
The provider receives notifications on CRUD operations related to the persisted resource and reloads the cached
configuration instance accordingly.

@see AmbariServerConfigurationProvider
ambari-server/src/main/java/org/apache/ambari/server/ldap/service/AmbariLdapConfigurationProvider.java