GUACAMOLE-1623: Extract domain field directly from the vault, or split out of username.

extensions/guacamole-vault/modules/guacamole-vault-base/pom.xml

@@ -59,6 +59,13 @@
             <artifactId>jackson-dataformat-yaml</artifactId>
         </dependency>
 
+        <!-- JUnit -->
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+
         <!-- Guice -->
         <dependency>
             <groupId>com.google.inject</groupId>