[F.REQ] Added ability to manage set of containers, brings ConteinersSet

[alex-agency]

Currently, application allows create dozens containers per one click, but you can't delete or stopped as same easily as create it.

It would be create to have ContainersSet, which will be new entity for Docker.
The ContainersSet will allow manage all containers inside this set simultaneously and fast.

[xlenz]

+1 for this one just because of interesting entity ;)