HTTPCLIENT-1526: No User-Agent set in tunneled proxy connection

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1610598 13f79535-47bb-0310-9956-ffa450edef68
HTTPCLIENT-1527: fixed HttpCore OSGi imports

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1610616 13f79535-47bb-0310-9956-ffa450edef68