GUACAMOLE-524: Updated comments and imports

extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/AuthenticationProviderService.java

@@ -265,9 +265,6 @@ public class AuthenticationProviderService {
      *     given LDAP connection, as a map of attribute name to
      *     corresponding attribute value.
      *
-     * @throws LDAPException
-     *     If an error occurs while searching for the user attributes.
-     *
      * @throws GuacamoleException
      *     If an error occurs retrieving the user DN or the attributes.
      */

extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/user/AuthenticatedUser.java

@@ -23,7 +23,6 @@ import com.google.inject.Inject;
 import java.util.HashMap;
 import java.util.Map;
 import org.apache.guacamole.net.auth.AbstractAuthenticatedUser;
-import org.apache.guacamole.net.auth.Attributes;
 import org.apache.guacamole.net.auth.AuthenticationProvider;
 import org.apache.guacamole.net.auth.Credentials;