Updated openstack/openstack
Project: openstack/heat  fe436b6dfc8eea693bc2d0637e45b98a1e736d6b

Move CooldownMixin into separate file

CooldownMixin is a class that can be shared between OS and AWS
auto-scaling implementations.  This patch moves it to a shared
subdirectory.

Implements: partial-blueprint reorg-asg-code
Change-Id: I40e470460e84944d317f5b1772fc562abf62896d