GUACAMOLE-393: Merge add extension logout/shutdown hooks

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/InjectedAuthenticationProvider.java

@@ -104,4 +104,9 @@ public abstract class InjectedAuthenticationProvider implements AuthenticationPr
                 authenticatedUser, credentials);
     }
 
+    @Override
+    public void shutdown() {
+        // Do nothing
+    }
+
 }

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/sharing/user/SharedUserContext.java

@@ -204,4 +204,9 @@ public class SharedUserContext implements UserContext {
         return Collections.<Form>emptyList();
     }
 
+    @Override
+    public void invalidate() {
+        // Nothing to invalidate
+    }
+
 }

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/user/ModeledUserContext.java

@@ -191,4 +191,9 @@ public class ModeledUserContext extends RestrictedObject
         return ModeledSharingProfile.ATTRIBUTES;
     }
 
+    @Override
+    public void invalidate() {
+        // Nothing to invalidate
+    }
+
 }

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/user/RemoteAuthenticatedUser.java

@@ -136,4 +136,9 @@ public abstract class RemoteAuthenticatedUser implements AuthenticatedUser {
         return authenticationProvider;
     }
 
+    @Override
+    public void invalidate() {
+        // Nothing to invalidate
+    }
+
 }