Fix build, adapt import of TimeUtil to new package

Commit Ib2cfcfd4 moved TimeUtil to another package.

Change-Id: Iafc193694fec1f51bbcfbe618d5f41a2ef065744
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/src/main/java/com/googlesource/gerrit/plugins/serverconfig/ServerConfigServlet.java b/src/main/java/com/googlesource/gerrit/plugins/serverconfig/ServerConfigServlet.java
index d41dffb..93f75a3 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/serverconfig/ServerConfigServlet.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/serverconfig/ServerConfigServlet.java
@@ -20,12 +20,12 @@
 import com.google.common.io.ByteStreams;
 import com.google.gerrit.audit.AuditEvent;
 import com.google.gerrit.audit.AuditService;
+import com.google.gerrit.common.TimeUtil;
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.registration.DynamicItem;
 import com.google.gerrit.httpd.WebSession;
 import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.config.SitePaths;
-import com.google.gerrit.server.util.TimeUtil;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;