Zanata can sometimes run into a "GC overhead limit exceeded" error
when running with the default 512m of RAM for the -Xmx JAVA_OPTS
variable.
Fortunately the Wildfly module we use has this as a variable for
it, using that (see manifests/install.pp for in the biemond-wildfly
module and associated standalone template for details).
Change-Id: I5d1f03c9d5cd57bb6bbf6650292173a3325cec4d
9ee18e3ba3