Split off config REST endpoints from giant server lib

Move Collections and RestViews for config into server/restapi/ They
form a new java_library which uses the server package as a client.

Resources stay put so plugins that handlers for existing resources do
not break.

Change-Id: I724cb3efe160d2f62fa1a67823999abad589e246

java/com/google/gerrit/server/restapi/config/DeleteTask.java

@@ -0,0 +1,41 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// 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 com.google.gerrit.server.restapi.config;
+
+import static com.google.gerrit.common.data.GlobalCapability.KILL_TASK;
+import static com.google.gerrit.common.data.GlobalCapability.MAINTAIN_SERVER;
+import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
+
+import com.google.gerrit.extensions.annotations.RequiresAnyCapability;
+import com.google.gerrit.extensions.common.Input;
+import com.google.gerrit.extensions.restapi.Response;
+import com.google.gerrit.extensions.restapi.RestModifyView;
+import com.google.gerrit.server.config.TaskResource;
+import com.google.gerrit.server.git.WorkQueue.Task;
+import com.google.inject.Singleton;
+
+@Singleton
+@RequiresAnyCapability({KILL_TASK, MAINTAIN_SERVER})
+public class DeleteTask implements RestModifyView<TaskResource, Input> {
+
+  @Override
+  public Response<?> apply(TaskResource rsrc, Input input) {
+    Task<?> task = rsrc.getTask();
+    boolean taskDeleted = task.cancel(true);
+    return taskDeleted
+        ? Response.none()
+        : Response.withStatusCode(SC_INTERNAL_SERVER_ERROR, "Unable to kill task " + task);
+  }
+}