Install metalsmith by default

It's a tiny library that provides convenient CLI for ironic.

Change-Id: I806d7fd181db8cd4be206796c8930466c6732d44

playbooks/roles/bifrost-ironic-install/tasks/install.yml

@@ -79,6 +79,14 @@
     source_install={{ ironicclient_source_install }}
   when: skip_install is not defined
 
+# NOTE(dtantsur): no much value in installing metalsmith from source - it does
+# not change often, and nothing in bifrost depends on it.
+- name: "metalsmith - Install"
+  include: pip_install.yml
+    package=metalsmith
+    state=latest
+  when: skip_install is not defined
+
 - name: "Install configparser in venv if using"
   include: pip_install.yml
     package=configparser

releasenotes/notes/metalsmith-7044429597a5f137.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    `MetalSmith <https://docs.openstack.org/metalsmith/>`_ is now installed
+    by default.