Make imports proper order

We have a rule for imports order. That is:
 stdlib
 third-party lib
 project
 http://docs.openstack.org/developer/hacking/#imports
But some files are not correct. This patch fixes it.

Change-Id: I0031677e30dd70a07125d7a11bc93963db2b8ce3

tempest/api/compute/admin/test_instance_usage_audit_log.py

@@ -14,10 +14,10 @@
 #    under the License.
 
 import datetime
+import urllib
 
 from tempest.api.compute import base
 from tempest import test
-import urllib
 
 
 class InstanceUsageAuditLogTestJSON(base.BaseV2ComputeAdminTest):

tempest/api/compute/admin/test_instance_usage_audit_log_negative.py

@@ -14,11 +14,11 @@
 #    under the License.
 
 import datetime
+import urllib
 
 from tempest.api.compute import base
 from tempest import exceptions
 from tempest import test
-import urllib
 
 
 class InstanceUsageAuditLogNegativeTestJSON(base.BaseV2ComputeAdminTest):

tempest/api/compute/admin/test_simple_tenant_usage.py

@@ -14,10 +14,10 @@
 #    under the License.
 
 import datetime
+import time
 
 from tempest.api.compute import base
 from tempest import test
-import time
 
 
 class TenantUsagesTestJSON(base.BaseV2ComputeAdminTest):

tempest/api/identity/admin/test_users_negative.py

@@ -13,11 +13,12 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import uuid
+
 from tempest.api.identity import base
 from tempest.common.utils import data_utils
 from tempest import exceptions
 from tempest.test import attr
-import uuid
 
 
 class UsersNegativeTestJSON(base.BaseIdentityV2AdminTest):

tempest/services/database/json/flavors_client.py

@@ -13,9 +13,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import urllib
+
 from tempest.common import rest_client
 from tempest import config
-import urllib
 
 CONF = config.CONF