HR fix for #255737

#255737 - UnsupportedClassVersionError: 
org/jboss/as/controller/PathAddress : Unsupported major.minor version 52.0

The upcoming WildFly 10 will support only JDK8 and will be compiled with 
JDK8. The IDE use some of its classes to connect to it and to do 
management. Thus it will throw UnsupportedClassVersionError when running 
on JDK7.

The fix safe as it just inform user it has run on JDK8 to use WildFly 10 
in case it is running on JDK7.

http://hg.netbeans.org/web-main/rev/5e11716c2f28

Thanks
P.