Add librarian example

examples/librarian/README

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+Usage
+=====
+
+Run it from /vagrant dir:
+
+```
+solar resource clear_all
+solar resource create nodes templates/nodes.yaml '{"count": 1}'
+solar resource create librarian_example examples/librarian/librarian.yaml '{"node": "node1"}'
+
+solar changes stage
+solar changes process
+solar orch run-once
+solar orch report -w 100
+```

examples/librarian/librarian.yaml

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+id: librarian_examples
+
+resources:
+  - id: librarian
+    location: {{node}}
+    from: resources/librarian
+    values:
+      modules:
+        - name: puppetlabs-ntp
+          version: 4.1.0
+        - name: puppet-keystone
+          type: git
+          url: https://github.com/openstack/puppet-keystone
+          ref: 5.1.0
+
+events:
+  - type: depends_on
+    parent_action: librarian.run
+    state: success
+    depend_action: rabbitmq_service1.run