[Found workaround]CLI tool still crashing and throwing errors in 2.1.0

Currently best practice to use mattermost 2.1.0 CLI in a GitLab omnibus install:

• copy en.json from /opt/gitlab/embedded/service/mattermost/i18n/ to /opt/gitlab/embedded/service/mattermost/
• make /opt/gitlab/embedded/service/mattermost/ your current directory
  • use sudo -u mattermost /opt/gitlab/embedded/bin/mattermost -config="/var/opt/gitlab/mattermost/config.json" ...
  • or su mattermost and then /opt/gitlab/embedded/bin/mattermost -config="/var/opt/gitlab/mattermost/config.json" ... if you didn't fuss to install sudo