Add property to skip integration tests

Generalize the `skip` property to start and stop goals so that one
can control if the Spring Boot app is starting via a configuration
property.

Note that this only controls the Spring Boot Maven plugin and the
failsafe maven plugin should be updated accordingly.

Closes gh-4922

spring-boot-tools/spring-boot-maven-plugin/src/it/start-stop-skip/invoker.properties

+invoker.goals=clean verify
\ No newline at end of file

spring-boot-tools/spring-boot-maven-plugin/src/it/start-stop-skip/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>org.springframework.boot.maven.it</groupId>
+	<artifactId>start-stop-skip</artifactId>
+	<version>0.0.1.BUILD-SNAPSHOT</version>
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+	</properties>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>@project.groupId@</groupId>
+				<artifactId>@project.artifactId@</artifactId>
+				<version>@project.version@</version>
+				<executions>
+					<execution>
+						<id>pre-integration-test</id>
+						<goals>
+							<goal>start</goal>
+						</goals>
+					</execution>
+					<execution>
+						<id>post-integration-test</id>
+						<goals>
+							<goal>stop</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<skip>true</skip>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+</project>

spring-boot-tools/spring-boot-maven-plugin/src/it/start-stop-skip/src/main/java/org/test/SampleApplication.java

+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * 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 org.test;
+
+/**
+ * This sample should not run at all
+ */
+public class SampleApplication {
+
+	public static void main(String[] args) throws Exception {
+		System.out.println("Ooops, I haz been run");
+	}
+
+}

spring-boot-tools/spring-boot-maven-plugin/src/it/start-stop-skip/verify.groovy

+import static org.junit.Assert.assertFalse
+
+def file = new File(basedir, "build.log")
+assertFalse 'Application should not have run', file.text.contains("Ooops, I haz been run")
+assertFalse 'Should not attempt to stop the app', file.text.contains('Stopping application')

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/AbstractRunMojo.java

@@ -151,6 +151,13 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 	@Parameter(property = "useTestClasspath", defaultValue = "false")
 	private Boolean useTestClasspath;
 
+	/**
+	 * Skip the execution.
+	 * @since 1.3.2
+	 */
+	@Parameter(defaultValue = "false")
+	private boolean skip;
+
 	/**
 	 * Specify if the application process should be forked.
 	 * @return {@code true} if the application process should be forked
@@ -170,6 +177,10 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 
 	@Override
 	public void execute() throws MojoExecutionException, MojoFailureException {
+		if (this.skip) {
+			getLog().debug("skipping run as per configuration.");
+			return;
+		}
 		final String startClassName = getStartClass();
 		run(startClassName);
 	}

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/StopMojo.java

@@ -62,8 +62,19 @@ public class StopMojo extends AbstractMojo {
 	@Parameter
 	private int jmxPort = 9001;
 
+	/**
+	 * Skip the execution.
+	 * @since 1.3.2
+	 */
+	@Parameter(defaultValue = "false")
+	private boolean skip;
+
 	@Override
 	public void execute() throws MojoExecutionException, MojoFailureException {
+		if (this.skip) {
+			getLog().debug("skipping stop as per configuration.");
+			return;
+		}
 		getLog().info("Stopping application...");
 		try {
 			if (Boolean.TRUE.equals(this.fork)) {