ISPN-4961 Bump parsers and schemas to 7.1

https://issues.jboss.org/browse/ISPN-4961
- Bump parsers and schemas to 7.1
- Altered org.infinispan.Version to retrieve the version using
maven-injection-plugin
- Improved SampleConfigFilesCorrectnessTest so that it accepts only
files with the latest schema
- Altered the documentation so that the version is dynamically replaced
that silly @rvansa doesn't even claim his own code :)