LfsBackend: Add implementation of toString

Change-Id: I88f206975566f3c961743faa9876139529e94c57
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsBackend.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsBackend.java
index ecdfa60..4971bcb 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsBackend.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsBackend.java
@@ -14,6 +14,8 @@
 
 package com.googlesource.gerrit.plugins.lfs;
 
+import static com.google.common.base.MoreObjects.toStringHelper;
+
 import com.google.common.base.Strings;
 import com.google.gerrit.common.Nullable;
 import java.util.Objects;
@@ -56,4 +58,9 @@
 
     return false;
   }
+
+  @Override
+  public String toString() {
+    return toStringHelper(this).add("name", name()).add("type", type).toString();
+  }
 }