[placement] cycle-highlights for stein required

Placement contributors, One of the things that should be done alongside placement having a Stein release is the creation of cycle highlights [1]. I've created an etherpad [2] to get us started, including links to more information and some examples. Please add to it. I'll refine it to something presentable and make the appropriate patch. [1] http://lists.openstack.org/pipermail/openstack-discuss/2019-March/003597.htm... [2] https://etherpad.openstack.org/p/stein-placement-cycle-highlights -- Chris Dent ٩◔̯◔۶ https://anticdent.org/ freenode: cdent tw: @anticdent