{util,finagle,scrooge,twitter-server}: Stop using shields.io
{util,finagle,scrooge,twitter-server}: Stop using shields.io

Summary: Problem

shields.io seems to have a poor success rate.

JIRA Issues: CSL-5005

Differential Revision: https://phabricator.twitter.biz/D78550

mkhq/finagle,mkhq/finagle,twitter/finagle,luciferous/finagle,twitter/finagle,mkhq/finagle,mkhq/finagle,luciferous/finagle,mkhq/finagle,twitter/finagle,twitter/finagle,twitter/finagle,luciferous/finagle,mkhq/finagle,luciferous/finagle,luciferous/finagle,luciferous/finagle