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.
The characteristics of a list are
o the order of the entries is significant
o duplicates are allowed
The characteristics of a set are
o the order is not significant
o duplicates are not allowed.
When describing keys for a step the characteristics of a
set applies here, whereas the characteristics of a list does
not apply.
