Add ability for diplaying hypervisor statistics

Added new command 'hypervisor stats show' for displaying
the hypervisor stats over all compute nodes.

Change-Id: I4f98c69135b04d4f6cea67cd6350d5d99fb79dba
Partial-Bug: #1423748

doc/source/command-objects/hypervisor-stats.rst

@@ -0,0 +1,16 @@
+================
+hypervisor stats
+================
+
+Compute v2
+
+hypervisor stats show
+---------------------
+
+Display hypervisor stats details
+
+.. program:: hypervisor stats show
+.. code:: bash
+
+    os hypervisor stats show
+

doc/source/commands.rst

@@ -88,6 +88,7 @@ referring to both Compute and Volume quotas.
 * ``group``: (**Identity**) a grouping of users
 * ``host``: Compute - the physical computer running a hypervisor
 * ``hypervisor``: (**Compute**) the virtual machine manager
+* ``hypervisor stats``: (**Compute**) hypervisor statistics over all compute nodes
 * ``identity provider``: (**Identity**) a source of users and authentication
 * ``image``: (**Image**) a disk image
 * ``ip fixed``: Compute, Network - an internal IP address assigned to a server

openstackclient/compute/v2/hypervisor_stats.py

@@ -0,0 +1,33 @@
+#   Licensed under the Apache License, Version 2.0 (the "License"); you may
+#   not use this file except in compliance with the License. You may obtain
+#   a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#   License for the specific language governing permissions and limitations
+#   under the License.
+#
+
+
+"""Hypervisor Stats action implementations"""
+
+import logging
+import six
+
+from cliff import show
+
+
+class ShowHypervisorStats(show.ShowOne):
+    """Display hypervisor stats details"""
+
+    log = logging.getLogger(__name__ + ".ShowHypervisorStats")
+
+    def take_action(self, parsed_args):
+        self.log.debug("take_action(%s)", parsed_args)
+        compute_client = self.app.client_manager.compute
+        hypervisor_stats = compute_client.hypervisors.statistics().to_dict()
+
+        return zip(*sorted(six.iteritems(hypervisor_stats)))

setup.cfg

@@ -82,6 +82,8 @@ openstack.compute.v2 =
     hypervisor_list = openstackclient.compute.v2.hypervisor:ListHypervisor
     hypervisor_show = openstackclient.compute.v2.hypervisor:ShowHypervisor
 
+    hypervisor_stats_show = openstackclient.compute.v2.hypervisor_stats:ShowHypervisorStats
+
     ip_fixed_add = openstackclient.compute.v2.fixedip:AddFixedIP
     ip_fixed_remove = openstackclient.compute.v2.fixedip:RemoveFixedIP