remove ironic support

OpenStack ironic is not currently supported, so remove
any code in rally that invokes ironicclient.

Signed-off-by: Vu Tran <vu.tran@windriver.com>

diff --git a/rally/benchmark/context/images.py b/rally/benchmark/context/images.py
index 9642af4..92abbf6 100644
--- a/rally/benchmark/context/images.py
+++ b/rally/benchmark/context/images.py
@@ -21,6 +21,7 @@ from rally import exceptions
 from rally.openstack.common import log as logging
 from rally import osclients
 from rally import utils as rutils
+from rally.openstack.common.gettextutils import _
 
 
 LOG = logging.getLogger(__name__)
diff --git a/rally/osclients.py b/rally/osclients.py
index af916b9..66522cd 100644
--- a/rally/osclients.py
+++ b/rally/osclients.py
@@ -19,7 +19,6 @@ from ceilometerclient import client as ceilometer
 from cinderclient import client as cinder
 import glanceclient as glance
 from heatclient import client as heat
-from ironicclient import client as ironic
 from keystoneclient import exceptions as keystone_exceptions
 from keystoneclient.v2_0 import client as keystone
 from neutronclient.neutron import client as neutron
@@ -204,16 +203,3 @@ class Clients(object):
                                    insecure=CONF.https_insecure,
                                    cacert=CONF.https_cacert)
         return client
-
-    @memoize('ironic')
-    def ironic(self, version='1.0'):
-        """Returns Ironic client."""
-        client = ironic.Client(version,
-                               username=self.endpoint.username,
-                               password=self.endpoint.password,
-                               tenant_name=self.endpoint.tenant_name,
-                               auth_url=self.endpoint.auth_url,
-                               timeout=CONF.openstack_client_http_timeout,
-                               insecure=CONF.https_insecure,
-                               cacert=CONF.https_cacert)
-        return client
diff --git a/requirements.txt b/requirements.txt
index 9ab2e61..318bcfe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,6 @@ python-neutronclient>=2.3.5,<3
 python-cinderclient>=1.0.6
 python-heatclient>=0.2.9
 python-ceilometerclient>=1.0.6
-python-ironicclient
 python-subunit>=0.0.18
 requests>=1.1
 SQLAlchemy>=0.7.8,!=0.9.5,<=0.9.99
diff --git a/tests/test_osclients.py b/tests/test_osclients.py
index 49cecb8..6ca03f4 100644
--- a/tests/test_osclients.py
+++ b/tests/test_osclients.py
@@ -161,22 +161,3 @@ class OSClientsTestCase(test.TestCase):
             mock_ceilometer.Client.assert_called_once_with("2", **kw)
             self.assertEqual(self.clients.cache["ceilometer"],
                              fake_ceilometer)
-
-    @mock.patch("rally.osclients.ironic")
-    def test_ironic(self, mock_ironic):
-        fake_ironic = fakes.FakeIronicClient()
-        mock_ironic.Client = mock.MagicMock(return_value=fake_ironic)
-        self.assertTrue("ironic" not in self.clients.cache)
-        client = self.clients.ironic()
-        self.assertEqual(client, fake_ironic)
-        kw = {
-            "username": self.endpoint.username,
-            "password": self.endpoint.password,
-            "tenant_name": self.endpoint.tenant_name,
-            "auth_url": self.endpoint.auth_url,
-            "timeout": cfg.CONF.openstack_client_http_timeout,
-            "insecure": cfg.CONF.https_insecure,
-            "cacert": cfg.CONF.https_cacert
-        }
-        mock_ironic.Client.assert_called_once_with("1.0", **kw)
-        self.assertEqual(self.clients.cache["ironic"], fake_ironic)