Use xml / javaconfig folders for samples

Fixes gh-3752

samples/xml/insecure/build.gradle

@@ -0,0 +1,14 @@
+apply from: WAR_SAMPLE_GRADLE
+
+dependencies {
+
+	providedCompile "javax.servlet:javax.servlet-api:3.0.1",
+					'javax.servlet.jsp:jsp-api:2.1'
+
+	compile jstlDependencies,
+			"org.slf4j:jcl-over-slf4j:$slf4jVersion"
+
+	runtime "ch.qos.logback:logback-classic:$logbackVersion"
+
+	integrationTestCompile gebDependencies
+}