Remove meaningless volume negative test

The removed negative test verified NotFound exception even if
passing invalid format value on URI with GET method.
The test is duplicated with test_volume_get_nonexistent_volume_id.
It doesn't have any value actually, and it is nice to remove
it from the integration test suite: Tempest.

NOTE: There is a similar test test_get_volume_without_passing_volume_id
      but we keep it at this time because the REST operation is like
        GET os-volumes/
      and it seems a general operation and it has some merit.

Change-Id: I7c99f61dc54ef7c437c7e4574eba935d76ef9318
diff --git a/tempest/api/compute/volumes/test_volumes_negative.py b/tempest/api/compute/volumes/test_volumes_negative.py
index 7ecad12..5fe4cb3 100644
--- a/tempest/api/compute/volumes/test_volumes_negative.py
+++ b/tempest/api/compute/volumes/test_volumes_negative.py
@@ -84,13 +84,6 @@
                           size='0', display_name=v_name, metadata=metadata)
 
     @test.attr(type=['negative'])
-    @test.idempotent_id('f01904f2-e975-4915-98ce-cb5fa27bde4f')
-    def test_get_invalid_volume_id(self):
-        # Negative: Should not be able to get volume with invalid id
-        self.assertRaises(lib_exc.NotFound,
-                          self.client.show_volume, '#$%%&^&^')
-
-    @test.attr(type=['negative'])
     @test.idempotent_id('62bab09a-4c03-4617-8cca-8572bc94af9b')
     def test_get_volume_without_passing_volume_id(self):
         # Negative: Should not be able to get volume when empty ID is passed