Move most overcloud params to an environmnent file
Move most overcloud params to an environmnent file

Heat environment files give us a way to serialise the parameters
needed to update a stack easily. This reduces one of the most annoying
bits about high frequency stack-updates.

Change-Id: I26f91980971fd4598b043bdb764359ac32a3c42a

rdo-management/tripleo,rdo-management/tripleo