narayana.sh script - JBOSS_HOME creation fix

The reason for this change is that I would like to have possibility to let the version of wildfly being expanded from asterix. I mean to set the property in this way:
export WILDFLY_MASTER_VERSION=8.0.0*
the wildcard is currently not usable as the JBOSS_HOME has to be already exapanded when it's passed to arquillian (at least it was the point where I have problems with current state)