Workaround MNG-4687

Also, use same jboss-parent version as main pom.xml

The MNG-4687 workaround is to get rid of this noise that appears in the build:

[WARNING] 
[WARNING] Some problems were encountered while building the effective model for org.jboss.as:jboss-as-build-config:jar:7.2.0.Alpha1-SNAPSHOT
[WARNING] 'parent.relativePath' points at org.jboss.as:jboss-as-parent instead of org.jboss:jboss-parent, please verify your project structure @ line 29, column 13
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]