Move resync functionality to controller

[richardcase]

Describe the solution you'd like:
Currently the core application contains functionality to "resync" all microvms. The term "resync" very much is related to controller implementation and therefore we should refactor this out of the application and into the controller infrastructure.

Why do you want this feature:

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]