Standardize Build

The build now uses spring build conventions to simplify the build

Fixes gh-4284

samples/xml/openid/openid.gradle

@@ -1,20 +0,0 @@
-// OpenID sample build file
-
-apply plugin: 'war'
-apply plugin: 'jetty'
-
-dependencies {
-	compile project(':spring-security-core'),
-			project(':spring-security-openid'),
-			"org.springframework:spring-webmvc:$springVersion"
-
-	providedCompile "javax.servlet:javax.servlet-api:$servletApiVersion"
-
-	runtime project(':spring-security-config'),
-			project(':spring-security-taglibs'),
-			jstlDependencies,
-			"org.slf4j:jcl-over-slf4j:$slf4jVersion",
-			"ch.qos.logback:logback-classic:$logbackVersion"
-}
-
-[jettyRun, jettyRunWar]*.contextPath = "/openid"

samples/xml/openid/spring-security-samples-xml-openid.gradle

@@ -0,0 +1,14 @@
+apply plugin: 'io.spring.convention.spring-sample-war'
+
+dependencies {
+	compile project(':spring-security-core')
+	compile project(':spring-security-openid')
+	compile 'org.springframework:spring-webmvc'
+
+	providedCompile 'javax.servlet:javax.servlet-api'
+
+	runtime project(':spring-security-config')
+	runtime project(':spring-security-taglibs')
+	runtime jstlDependencies
+	runtime slf4jDependencies
+}