Stop including ironic::drivers::ssh in the ironic-conductor profile

The SSH drivers are deprecated, pxe_ipmitool + virtualbmc should be used instead.
This is a follow-up to blueprint switch-to-virtualbmc.

Change-Id: I4fd567dffa3992042eebcf495334b8130e1bdc9f

manifests/profile/base/ironic/conductor.pp

@@ -43,7 +43,10 @@ class tripleo::profile::base::ironic::conductor (
       include ::ironic::drivers::drac
       include ::ironic::drivers::ilo
       include ::ironic::drivers::ipmi
-      include ::ironic::drivers::ssh
+      # TODO: deprecated code cleanup, remove in Queens
+      ironic_config {
+        'ssh/libvirt_uri': ensure => absent;
+      }
 
       # Configure access to other services
       include ::ironic::drivers::inspector

releasenotes/notes/ironic-ssh-removal-e5f40b477cf7357c.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Out-of-box support for Ironic ``*_ssh`` drivers was removed. These drivers
+    were deprecated in the Newton release.