Move plugin underneath 'its' package hierarchy This plugin was called 'hooks-jira' before, which lived underneath '[...].plugins.hooks.jira'. Some time ago, the repository got renamed to 'its-jira', 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: I416be94bf2581c8e8db712c31a7d5094595c1b65