Copied SSLContextBuilder tests from HttpClient

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1631214 13f79535-47bb-0310-9956-ffa450edef68
RAT check to exclude truststore files

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1631217 13f79535-47bb-0310-9956-ffa450edef68
Update Apache Commons Logging version from 1.1.3 to 1.2.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1631264 13f79535-47bb-0310-9956-ffa450edef68