HTTPCLIENT-1317 InetAddressUtils should handle IPv6 Addresses with Embedded IPv4 Addresses


git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1444926 13f79535-47bb-0310-9956-ffa450edef68
Make repeat string in IPv4 expression more obvious
Remove non-capturing groups for clarity

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1444942 13f79535-47bb-0310-9956-ffa450edef68