HTTPCLIENT-1585: SSLContextBuilder to preserve natural order of trust / key managers when loading trust / ket material from multiple sources

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1644009 13f79535-47bb-0310-9956-ffa450edef68
Added @Obsolete and @Experimental annotations

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1644012 13f79535-47bb-0310-9956-ffa450edef68