Fix `pgshovel-inspect-group` command.
Fix `pgshovel-inspect-group` command.

Reviewers: danf, tail, jeff

Reviewed By: jeff

Differential Revision: http://phabricator.local.disqus.net/D16685

fuziontech/pgshovel,fuziontech/pgshovel,fuziontech/pgshovel,disqus/pgshovel,disqus/pgshovel