Integration tests for the minimal HttpClient

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1430866 13f79535-47bb-0310-9956-ffa450edef68
Small tweaks to MinimalHttpClient

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1430867 13f79535-47bb-0310-9956-ffa450edef68