WFCORE-129 - overlay does not work for zipped files in exploded archive

WFLY: https://issues.jboss.org/browse/WFCORE-129
6.4.0: https://bugzilla.redhat.com/show_bug.cgi?id=1147352
The reason for exploded files being treated differently was because JBoss Web and (and now Undertow) do not use VFS to serve resources. If you just do a VFS mount for this case it will be invisible to the default servlet. Why don't you just create the parent directories?