Move plugin underneath 'its' package hierarchy This plugin was called 'hooks-rtc' before, which lived underneath '[...].plugins.hooks.rtc'. Some time ago, the repository got renamed to 'its-rtc', but the package name has not yet been updated. Hence we update it now to match the package of its-phabricator and its-storyboard. Change-Id: Iaad140d30c172d61bcba912a6c90e30dfe330aa3