With change I2f367b06e683ed7c815dd9e0536a46e5f0a27e6c, nova-compute
now unconditionally requires Placement 1.14 to be available (the
client side code doesn't check to see if 1.14 is available before
trying to use it).
This change updates the nova-status check for the minimum required
version of Placement and also starts the "Queens" section of the
Placement upgrade notes docs.
Change-Id: I37415e384d375bc9b548a0223f787a9236286bb0
4b7a150584