Change tempest NotFound exc to tempest-lib exc

This commit changes tempest.exceptions.NotFound to
tempest_lib.exceptions.NotFound. This is one of the migrating
rest client to tempest-lib works.

Change-Id: I2be04f600e6bd8d7d78948d25395d8e04fa0dea3
diff --git a/tempest/api/compute/images/test_images_negative.py b/tempest/api/compute/images/test_images_negative.py
index 58fc20d..cf127ee 100644
--- a/tempest/api/compute/images/test_images_negative.py
+++ b/tempest/api/compute/images/test_images_negative.py
@@ -12,10 +12,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from tempest_lib import exceptions as lib_exc
+
 from tempest.api.compute import base
 from tempest.common.utils import data_utils
 from tempest import config
-from tempest import exceptions
 from tempest import test
 
 CONF = config.CONF
@@ -49,7 +50,7 @@
         # Create a new image after server is deleted
         name = data_utils.rand_name('image')
         meta = {'image_type': 'test'}
-        self.assertRaises(exceptions.NotFound,
+        self.assertRaises(lib_exc.NotFound,
                           self.create_image_from_server,
                           server['id'], name=name, meta=meta)
 
@@ -61,7 +62,7 @@
         meta = {'image_type': 'test'}
         resp = {}
         resp['status'] = None
-        self.assertRaises(exceptions.NotFound, self.create_image_from_server,
+        self.assertRaises(lib_exc.NotFound, self.create_image_from_server,
                           '!@#$%^&*()', name=name, meta=meta)
 
     @test.attr(type=['negative', 'gate'])
@@ -84,7 +85,7 @@
         # Return an error if Image ID passed is 35 characters or less
         snapshot_name = data_utils.rand_name('test-snap-')
         test_uuid = ('a' * 35)
-        self.assertRaises(exceptions.NotFound, self.client.create_image,
+        self.assertRaises(lib_exc.NotFound, self.client.create_image,
                           test_uuid, snapshot_name)
 
     @test.attr(type=['negative', 'gate'])
@@ -92,13 +93,13 @@
         # Return an error if Image ID passed is 37 characters or more
         snapshot_name = data_utils.rand_name('test-snap-')
         test_uuid = ('a' * 37)
-        self.assertRaises(exceptions.NotFound, self.client.create_image,
+        self.assertRaises(lib_exc.NotFound, self.client.create_image,
                           test_uuid, snapshot_name)
 
     @test.attr(type=['negative', 'gate'])
     def test_delete_image_with_invalid_image_id(self):
         # An image should not be deleted with invalid image id
-        self.assertRaises(exceptions.NotFound, self.client.delete_image,
+        self.assertRaises(lib_exc.NotFound, self.client.delete_image,
                           '!@$%^&*()')
 
     @test.attr(type=['negative', 'gate'])
@@ -106,28 +107,28 @@
         # Return an error while trying to delete a non-existent image
 
         non_existent_image_id = '11a22b9-12a9-5555-cc11-00ab112223fa'
-        self.assertRaises(exceptions.NotFound, self.client.delete_image,
+        self.assertRaises(lib_exc.NotFound, self.client.delete_image,
                           non_existent_image_id)
 
     @test.attr(type=['negative', 'gate'])
     def test_delete_image_blank_id(self):
         # Return an error while trying to delete an image with blank Id
-        self.assertRaises(exceptions.NotFound, self.client.delete_image, '')
+        self.assertRaises(lib_exc.NotFound, self.client.delete_image, '')
 
     @test.attr(type=['negative', 'gate'])
     def test_delete_image_non_hex_string_id(self):
         # Return an error while trying to delete an image with non hex id
         image_id = '11a22b9-120q-5555-cc11-00ab112223gj'
-        self.assertRaises(exceptions.NotFound, self.client.delete_image,
+        self.assertRaises(lib_exc.NotFound, self.client.delete_image,
                           image_id)
 
     @test.attr(type=['negative', 'gate'])
     def test_delete_image_negative_image_id(self):
         # Return an error while trying to delete an image with negative id
-        self.assertRaises(exceptions.NotFound, self.client.delete_image, -1)
+        self.assertRaises(lib_exc.NotFound, self.client.delete_image, -1)
 
     @test.attr(type=['negative', 'gate'])
     def test_delete_image_id_is_over_35_character_limit(self):
         # Return an error while trying to delete image with id over limit
-        self.assertRaises(exceptions.NotFound, self.client.delete_image,
+        self.assertRaises(lib_exc.NotFound, self.client.delete_image,
                           '11a22b9-12a9-5555-cc11-00ab112223fa-3fac')