Quickstart pom files inconsistencies

1. helloworld/pom.xml: <!-- Import the Servlet API, we use provided scope as the API is included in WildFly {}> should be changed to <! Import the Servlet API, we use provided scope as the API is included in JBoss EAP -->
2. Root pom.xml has a <url> element pointing to https://github.com/wildfly/quickstart - it should point to https://github.com/jboss-developer/jboss-eap-quickstarts
3. Root pom.xml shouldn't include org.wildfly.plugins:wildfly-maven-plugin and it's version definition as there is a eap-maven-plugin definition in each QS pom.xml file.