Improve deployment index page

Description

This was issued out from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22380#note_110110835

Today, we have deployment index page. It looks like

Screenshot_from_2018-10-17_16-00-19

Here is a couple of thoughts from @dimitrieh

  • Real time updating of the list (so deployments go from deploying => deployed similar to pipeline list view or merge request widget)
  • "Deploying" badge
  • removal of action buttons when the row represents a deploying deployment
  • env Stop button disabled when there is a deployment in progress