Download public suffix list from Mozilla maintained <https://publicsuffix.org/>

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1623393 13f79535-47bb-0310-9956-ffa450edef68
Added a statement to NOTICE regarding distribution of the Public Suffix List copied from <https://publicsuffix.org/list/effective_tld_names.dat> licensed under MPLv2; added MPLv2 license text

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1623394 13f79535-47bb-0310-9956-ffa450edef68