UIMA-4069 Redesign of JD toward the main goal of classpath separation for container (system) code.

SystemPropertiesHelper - add isRequired() method.

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1639854 13f79535-47bb-0310-9956-ffa450edef68
UIMA-4069 Redesign of JD toward the main goal of classpath separation for container (system) code.

JD daemon - revisions for initial support.

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1639855 13f79535-47bb-0310-9956-ffa450edef68