move Dell EMC SC driver exceptions

This patch moves the Dell EMC SC exceptions to the driver.

Change-Id: I83ab1925dd7eb39cf64b9853cd65e2b7cb06e833

cinder/exception.py

@@ -948,16 +948,6 @@ class VolumeDeviceNotFound(CinderException):
     message = _('Volume device not found at %(device)s.')
 
 
-# Driver specific exceptions
-# Dell
-class DellDriverRetryableException(VolumeBackendAPIException):
-    message = _("Retryable Dell Exception encountered")
-
-
-class DellDriverUnknownSpec(VolumeDriverException):
-    message = _("Dell driver failure: %(reason)s")
-
-
 # RemoteFS drivers
 class RemoteFSException(VolumeDriverException):
     message = _("Unknown RemoteFS exception")

cinder/tests/unit/volume/drivers/dell_emc/sc/test_scapi.py

@@ -8954,7 +8954,8 @@ class DellHttpClientTestCase(test.TestCase):
                        'get')
     def test_wait_for_async_complete_get_raises(self,
                                                 mock_get):
-        mock_get.side_effect = (exception.DellDriverRetryableException())
+        mock_get.side_effect = (
+            storagecenter_api.DellDriverRetryableException())
         self.assertRaises(exception.VolumeBackendAPIException,
                           self.httpclient._wait_for_async_complete,
                           self.ASYNCTASK)

cinder/volume/drivers/dell_emc/sc/storagecenter_api.py

@@ -31,6 +31,10 @@ from cinder import utils
 LOG = logging.getLogger(__name__)
 
 
+class DellDriverRetryableException(exception.VolumeBackendAPIException):
+    message = _("Retryable Dell Exception encountered")
+
+
 class PayloadFilter(object):
     """PayloadFilter
 
@@ -229,7 +233,7 @@ class HttpClient(object):
         return rest_response
 
     @utils.retry(exceptions=(requests.ConnectionError,
-                             exception.DellDriverRetryableException))
+                             DellDriverRetryableException))
     def get(self, url):
         LOG.debug('get: %(url)s', {'url': url})
         rest_response = self.session.get(self.__formatUrl(url),
@@ -240,7 +244,7 @@ class HttpClient(object):
         if (rest_response and rest_response.status_code == (
                 http_client.BAD_REQUEST)) and (
                     'Unhandled Exception' in rest_response.text):
-            raise exception.DellDriverRetryableException()
+            raise DellDriverRetryableException()
         return rest_response
 
     @utils.retry(exceptions=(requests.ConnectionError,))