Add tests to show compressed IPv6 addresses cannot have too many leading or trailing fields

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1445023 13f79535-47bb-0310-9956-ffa450edef68
Show repeated string in compressed pattern

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1445026 13f79535-47bb-0310-9956-ffa450edef68