UIMA-4066 simplified HTTPClient related functionality

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1644980 13f79535-47bb-0310-9956-ffa450edef68
UIMA-4066 synchronized code that add props to http header

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1645030 13f79535-47bb-0310-9956-ffa450edef68
UIMA-4069 DUCC Job Driver (JD) system classpath

Add flag JpType = "uima-as"

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1645033 13f79535-47bb-0310-9956-ffa450edef68
UIMA-4066 synchronized execute 

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1645038 13f79535-47bb-0310-9956-ffa450edef68