Control docker version within stack

Docker version was originally controlled within engine repository
but it is more appropriate to control it within the stack as the
version requirements could be different across the stacks. See the
dependent change for how it was controlled before.

Depends-On: Id5f2c72e35bba4d5ab413f7b19119330540f5674
Change-Id: I745f57eb4c24cd7c997640ceb13350d4da2c4a72
1 file changed