Move most undercloud params to an environment file
Move most undercloud params to an environment file

This is my effort to replicate new changes from overcloud
I26f91980971fd4598b043bdb764359ac32a3c42a to undercloud as well.
Heat environment files give us a way to serialise the parameters
needed to create a stack easily.

Change-Id: I8ff50ca092e1209167cd9818b680f56a7512bba3

rdo-management/tripleo,rdo-management/tripleo