FORGE-1953: Add command to get and set JVM system properties

This PR is intended to implement the feature request https://issues.jboss.org/browse/FORGE-1953.

The idea is to add a new command to get/set system properties.
"system-list-properties"
"system-set-property" 

or

"jvm-list-system-properties"
"jvm-set-system-property"

would follow our naming conventions.