Deprecate PluginDaemonTest

PluginDaemonTest was a first attempt to bring IT tests to plugins. The
new LightweightPluginDaemonTest class, however, allows to have faster
and simpler tests.

Change-Id: Ie0273c018ae100c4b294803c438c4bb105505335

gerrit-acceptance-framework/src/test/java/com/google/gerrit/acceptance/PluginDaemonTest.java

@@ -38,6 +38,10 @@ import java.util.Properties;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+/**
+ * @deprecated use {@link LightweightPluginDaemonTest} instead.
+ */
+@Deprecated
 public abstract class PluginDaemonTest extends AbstractDaemonTest {
 
   private static final String BUCKLC = "buck";