After the dependent changes merge, no jobs are using devstack-f20
nodes so we can remove them.
The one specific work-around in the puppet-scripts is removed. The
logging configuration for nodepool is also regenerated.
Change-Id: I435f0d95dbe7f5d8e90c1fe8368dd42ebb241c88
Depends-On: Ifa742ba5bdae0b796b8b92336e41234fd8b7939e
Depends-On: I4773d3ba1ee29880e928e25257ce188e7bd7dc90