Adjust import order according to PEP8 imports rule

This patch just adjust import order to follow PEP8 imports rule.
See http://www.python.org/dev/peps/pep-0008/#imports

Imports should be grouped in the following order:
1) Standard library imports
2) Related third party imports
3) Local application/library specific imports

Change-Id: Ifb56bbe6ba1ed7682c3326d6429fb34d268e7ea4

climate/manager/service.py

@@ -14,9 +14,9 @@
 # limitations under the License.
 
 import datetime
-import eventlet
 import six
 
+import eventlet
 from oslo.config import cfg
 from stevedore import enabled
 

climate/notification/notifier.py

@@ -13,10 +13,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from climate.openstack.common import log
 from oslo.config import cfg
 from oslo import messaging
 
+from climate.openstack.common import log
+
 notification_opts = [
     cfg.StrOpt('publisher_id',
                default="climate.lease",

climate/plugins/instances/vm_plugin.py

@@ -14,6 +14,7 @@
 # limitations under the License.
 
 import eventlet
+from novaclient import exceptions as nova_exceptions
 from oslo.config import cfg
 
 from climate import exceptions as climate_exceptions
@@ -21,7 +22,6 @@ from climate.openstack.common import log as logging
 from climate.plugins import base
 from climate.plugins import instances as plugin
 from climate.utils.openstack import nova
-from novaclient import exceptions as nova_exceptions
 
 LOG = logging.getLogger(__name__)
 

climate/plugins/oshosts/host_plugin.py

@@ -22,7 +22,6 @@ import uuid
 from oslo.config import cfg
 
 from climate import context
-
 from climate.db import api as db_api
 from climate.db import exceptions as db_ex
 from climate.db import utils as db_utils

climate/plugins/oshosts/nova_inventory.py

@@ -13,9 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from oslo.config import cfg
-
 from novaclient import exceptions as nova_exceptions
+from oslo.config import cfg
 
 from climate import context
 from climate.manager import exceptions as manager_exceptions

climate/policy.py

@@ -16,6 +16,7 @@
 """Policy Engine For Climate."""
 
 import functools
+
 from oslo.config import cfg
 
 from climate import context