Fix Bug1029334 :Skip Test removed from test_volumes_negative

Change-Id: I6a5c68e35fdd1013e06e14a0ba9dee941f7eebfb
diff --git a/tempest/tests/compute/test_volumes_negative.py b/tempest/tests/compute/test_volumes_negative.py
index cacea93..8d67fff 100644
--- a/tempest/tests/compute/test_volumes_negative.py
+++ b/tempest/tests/compute/test_volumes_negative.py
@@ -72,7 +72,6 @@
         else:
             self.fail('Should not be able to DELETE a nonexistant volume')
 
-    @unittest.skip('Until bug 1006857 is fixed.')
     @raises(exceptions.BadRequest)
     @attr(type='negative')
     def test_create_volume_with_invalid_size(self):
@@ -86,7 +85,6 @@
                                                  display_name=v_name,
                                                  metadata=metadata)
 
-    @unittest.skip('Until bug 1006857 is fixed.')
     @raises(exceptions.BadRequest)
     @attr(type='negative')
     def test_create_volume_with_out_passing_size(self):
@@ -100,7 +98,6 @@
                                                  display_name=v_name,
                                                  metadata=metadata)
 
-    @unittest.skip('Until bug 1006875 is fixed.')
     @raises(exceptions.BadRequest)
     @attr(type='negative')
     def test_create_volume_with_size_zero(self):