Add support for specifying key-name per label

In order to support putting less things into images via puppet in Infra,
we'd like to be able to pre-populate our clouds with keypairs for the
infra-root accounts and have nova add those at boot time.

Change-Id: I9e2c990040342de722f68de09f273005f57a699f

doc/source/configuration.rst

@@ -465,3 +465,9 @@ Example configuration::
     Determine the flavor to use (e.g. ``m1.medium``, ``m1.large``,
     etc).  The smallest flavor that meets the ``min-ram`` requirements
     will be chosen.
+
+**optional**
+
+  ``key-name``
+    If given, is the name of a keypair that will be used when booting each
+    server.

nodepool/cmd/config_validator.py

@@ -34,6 +34,7 @@ class ConfigValidator:
             v.Required('diskimage'): str,
             'min-ram': int,
             'flavor-name': str,
+            'key-name': str,
         }
 
         pool_label = v.All(pool_label_main,

nodepool/config.py

@@ -89,7 +89,8 @@ class ProviderLabel(ConfigValue):
     def __eq__(self, other):
         if (other.diskimage != self.diskimage or
             other.min_ram != self.min_ram or
-            other.flavor_name != self.flavor_name):
+            other.flavor_name != self.flavor_name or
+            other.key_name != self.key_name):
             return False
         return True
 
@@ -250,6 +251,7 @@ def loadConfig(config_path):
                 pl.diskimage = newconfig.diskimages[label['diskimage']]
                 pl.min_ram = label.get('min-ram', 0)
                 pl.flavor_name = label.get('flavor-name', None)
+                pl.key_name = label.get('key-name')
                 top_label = newconfig.labels[pl.name]
                 top_label.pools.append(pp)
 

nodepool/nodepool.py

@@ -280,6 +280,7 @@ class NodeLauncher(threading.Thread, StatsReporter):
             image_id=cloud_image.external_id,
             min_ram=self._label.min_ram,
             flavor_name=self._label.flavor_name,
+            key_name=self._label.key_name,
             az=self._node.az,
             config_drive=self._diskimage.config_drive,
             nodepool_node_id=self._node.id,