We know about two issues:
1.) groovy based file systems checks seems to be executed on Jenkins
master even if there is a node which is dispatched to a slave.
2.) Environment variable contained in the value of a provided
variable are not expanded. Example: In case we describe neoHome like
"$JENKINS_HOME/tools/neo" we do not expand $JENKINS_HOME. Hence the
file exists check for file '$JENKINS_HOME/tools/neo' fails.
