Remove manual Gradle plugin versionManagement test

Following the move to using the separate dependency management plugin
this test is no longer valid. It should have been removed as part of
2c3c62d7

See gh-2133

spring-boot-tools/spring-boot-gradle-plugin/src/manual-test/versionManagement/build.gradle

@@ -1,29 +0,0 @@
-buildscript {
-	ext {
-		springBootVersion = '1.1.0.BUILD-SNAPSHOT'
-	}
-	repositories {
-		mavenLocal()
-	}
-	dependencies {
-		classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
-	}
-}
-
-apply plugin: 'java'
-apply plugin: 'spring-boot'
-
-repositories {
-	mavenLocal()
-	mavenCentral()
-	maven { url "http://repo.spring.io/release" }
-	maven { url "http://repo.spring.io/milestone" }
-	maven { url "http://repo.spring.io/snapshot" }
-}
-
-dependencies {
-	versionManagement("io.spring.platform:platform-versions:1.0.0.BUILD-SNAPSHOT@properties")
-	compile("org.springframework.boot:spring-boot-starter")
-	compile("org.springframework.data:spring-data-hadoop")
-	testCompile("org.springframework.boot:spring-boot-starter-test")
-}

spring-boot-tools/spring-boot-gradle-plugin/src/manual-test/versionManagement/readme.txt

@@ -1,3 +0,0 @@
-simple manual test to show how versionManagement dependencies can be used
-
-run gradle dependencies and check that there are no failures

spring-boot-tools/spring-boot-gradle-plugin/src/manual-test/versionManagement/src/main/java/VersionManagementApplication.java

@@ -1,22 +0,0 @@
-/*
- * Copyright 2012-2014 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.
- */
-
-public class VersionManagementApplication {
-
-	public static void main(String[] args) {
-	}
-
-}