Don't use snapshot repos for CLI test

Update SampleIntegrationTests to only use local maven repo when
running integration tests.

spring-boot-cli/src/main/java/org/springframework/boot/cli/compiler/GrapeEngineCustomizer.java

@@ -85,10 +85,12 @@ class GrapeEngineCustomizer {
 		springBootResolver.setSettings(settings);
 		springBootResolver.setName("springBoot");
 
+		if (!Boolean.getBoolean("disableSpringSnapshotRepos")) {
 			springBootResolver.addSpringSnapshotResolver(newResolver("spring-snapshot",
 					"http://repo.springsource.org/snapshot"));
 			springBootResolver.addSpringSnapshotResolver(newResolver("spring-milestone",
 					"http://repo.springsource.org/milestone"));
+		}
 
 		grapesResolver.getResolvers().clear();
 		grapesResolver.getResolvers().add(springBootResolver);

spring-boot-cli/src/test/java/org/springframework/boot/cli/SampleIntegrationTests.java

@@ -24,6 +24,7 @@ import java.util.concurrent.TimeUnit;
 
 import org.apache.ivy.util.FileUtil;
 import org.junit.After;
+import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
@@ -64,6 +65,16 @@ public class SampleIntegrationTests {
 		this.command = future.get(4, TimeUnit.MINUTES);
 	}
 
+	@Before
+	public void setup() {
+		System.setProperty("disableSpringSnapshotRepos", "true");
+	}
+
+	@After
+	public void teardown() {
+		System.clearProperty("disableSpringSnapshotRepos");
+	}
+
 	@After
 	public void stop() {
 		if (this.command != null) {