Don't prompt to confirm non-mutating nomulus EPP tool commands

This is accomplished by making all non-mutating commands function with dry run set
to true, which also has the pleasurable side effect of not prompting for dry-run
mutating commands either, which also do nothing different/special on the second
run.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=192149150

java/google/registry/tools/NonMutatingEppToolCommand.java

@@ -0,0 +1,32 @@
+// Copyright 2018 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.tools;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/** A non-mutating EPP command (that does not prompt for confirmation). */
+abstract class NonMutatingEppToolCommand extends EppToolCommand {
+
+  @Override
+  protected boolean isDryRun() {
+    return true;
+  }
+
+  @Override
+  protected boolean checkExecutionState() {
+    checkArgument(!force, "--force is unnecessary with non-mutating EPP tool commands");
+    return true;
+  }
+}