Watcher: Move YAML test into own project to not interfere with client tests (elastic/elasticsearch#2804)

This particular test requires Elasticsearch to run on port 9400, which is not
guaranteed if the clients run their own tests, as it is a matter of configuration
in gradle.

Therefore these tests need to run in their project.

Original commit: elastic/x-pack-elasticsearch@da38407766

elasticsearch/qa/smoke-test-watcher/build.gradle

@@ -0,0 +1,14 @@
+apply plugin: 'elasticsearch.rest-test'
+
+dependencies {
+  testCompile project(path: ':x-plugins:elasticsearch:x-pack', configuration: 'runtime')
+}
+
+integTest {
+  cluster {
+    plugin 'x-pack', project(':x-plugins:elasticsearch:x-pack')
+    setting 'xpack.security.enabled', 'false'
+    setting 'xpack.monitoring.enabled', 'false'
+    setting 'http.port', '9400'
+  }
+}

elasticsearch/qa/smoke-test-watcher/src/test/java/org/elasticsearch/smoketest/WatcherGettingStartedIT.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.smoketest;
+
+import com.carrotsearch.randomizedtesting.annotations.Name;
+import com.carrotsearch.randomizedtesting.annotations.ParametersFactory;
+import org.elasticsearch.test.rest.ESRestTestCase;
+import org.elasticsearch.test.rest.RestTestCandidate;
+import org.elasticsearch.test.rest.parser.RestTestParseException;
+import org.junit.After;
+import org.junit.Before;
+
+import java.io.IOException;
+
+import static java.util.Collections.emptyList;
+import static java.util.Collections.emptyMap;
+
+/** Runs rest tests against external cluster */
+public class WatcherGettingStartedIT extends ESRestTestCase {
+
+    public WatcherGettingStartedIT(@Name("yaml") RestTestCandidate testCandidate) {
+        super(testCandidate);
+    }
+
+    @ParametersFactory
+    public static Iterable<Object[]> parameters() throws IOException, RestTestParseException {
+        return ESRestTestCase.createParameters(0, 1);
+    }
+
+    @Before
+    public void startWatcher() throws Exception {
+        getAdminExecutionContext().callApi("xpack.watcher.start", emptyMap(), emptyList(), emptyMap());
+    }
+
+    @After
+    public void stopWatcher() throws Exception {
+        getAdminExecutionContext().callApi("xpack.watcher.stop", emptyMap(), emptyList(), emptyMap());
+    }
+}

elasticsearch/qa/smoke-test-watcher/src/test/resources/rest-api-spec/test/watcher_getting_started/10_monitor_cluster_health.yaml

@@ -1,3 +1,6 @@
+# This test has been moved out of the regular tests as it requires Elasticsearch to run on port 9400
+# That is a no-go for the clients testing, who could start Elasticsearch on arbitrary ports
+#
 ---
 setup:
   - do: