Add barematal-specific nodes files with toplogy

https://review.openstack.org/#/c/553465 add a generic
baremetal nodes file.
This review makes the nodes file match the topology
as with other deployment environments.

Change-Id: Ib839da96b31afab38545f35dd4f9f008628d29be

config/nodes/baremetal_1ctlr_1comp.yml

@@ -0,0 +1,2 @@
+# Overcloud nodes are defined in hardware-specific files.
+overcloud_nodes:

config/nodes/baremetal_3ctlr_1comp.yml

@@ -0,0 +1,10 @@
+# Deploy an HA openstack environment.
+
+# Three controller nodes and one compute node are defined
+# hardware-specific files
+overcloud_nodes:
+
+# Tell tripleo which nodes to deploy.
+topology: >-
+  --compute-scale 1
+  --control-scale 3