Upgrade jetty-maven-plugin and configure war path

Configuring war path enables `mvn jetty:run-war`.

Author: praseodym

openid-connect-server-webapp/pom.xml

@@ -78,6 +78,7 @@
 <groupId>org.eclipse.jetty</groupId>
 <artifactId>jetty-maven-plugin</artifactId>
 <configuration>
+<war>${project.build.directory}/openid-connect-server-webapp.war</war>
 <webAppConfig>
 <contextPath>/openid-connect-server-webapp</contextPath>
 </webAppConfig>

pom.xml

@@ -117,7 +117,7 @@
 <plugin>
 <groupId>org.eclipse.jetty</groupId>
 <artifactId>jetty-maven-plugin</artifactId>
-<version>9.1.1.v20140108</version>
+<version>9.3.3.v20150827</version>
 </plugin>
 <plugin>
 <inherited>true</inherited>