448085: exclude files generator from analysis

Sonarqube reports massive code duplication in

**/EmfParsleyViewFilesGenerator.java,**/EmfParsleyProjectFilesGenerator.java 

but they're generated by Xtend and they are basically template
generators

Change-Id: Id49a6d7073197d775d9ac624abde4d8e58d264e4
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=448085