[ERM-7] Live log/status display of the rollout process

[smiakchilo]

As a Rollout Manager user,
I would like to see the updates as to what page is being rolled out to what exact locale at this moment of time -- especially if the process takes tenths of seconds or minutes.
This can look somewhat similar to the live log screen area in the "classic" PackageManager or BackPack. Or else, it can be a "Windows Explorer progress bar-style"