Favor groovy.jar instead of groovy-all.jar

Update CLI application to use groovy.jar rather than groovy-all.jar.
This prevents classloading issues when a user project @Grabs groovy-ant.

spring-boot-cli/src/test/resources/repro-samples/grab-ant-builder.groovy

@@ -0,0 +1,11 @@
+@Grab("org.codehaus.groovy:groovy-ant:2.1.6")
+
+@RestController
+class MainController {
+
+	@RequestMapping("/")
+	def home() {
+		new AntBuilder().echo(message:"Hello world")
+		[message: "Hello World"]
+	}
+}