Adapt plugin to Gerrit 3.1 API

Change-Id: I49b0680c0d188887cc2c04d14e436ae938c13f5f

src/main/java/com/googlesource/gerrit/plugins/serverconfig/ServerConfigServlet.java

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 5ccbc9d..4959224 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/serverconfig/ServerConfigServlet.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/serverconfig/ServerConfigServlet.java
@@ -25,7 +25,7 @@
 import com.google.gerrit.extensions.registration.DynamicItem;
 import com.google.gerrit.httpd.WebSession;
 import com.google.gerrit.server.CurrentUser;
-import com.google.gerrit.server.audit.AuditEvent;
+import com.google.gerrit.server.AuditEvent;
 import com.google.gerrit.server.audit.AuditService;
 import com.google.gerrit.server.config.SitePaths;
 import com.google.gerrit.server.util.time.TimeUtil;