Unskip test_rescope_token()

test_rescope_token() was skipped  because of bug 1351026 which is now
in a state which should allow us to unskip it.

Change-Id: Ia0fd713fea041c24f4ff1f041a48d9bac7fef6e7
Related-Bug: #1351026
diff --git a/tempest/api/identity/admin/v3/test_tokens.py b/tempest/api/identity/admin/v3/test_tokens.py
index 68d61f6..230e09f 100644
--- a/tempest/api/identity/admin/v3/test_tokens.py
+++ b/tempest/api/identity/admin/v3/test_tokens.py
@@ -47,7 +47,6 @@
         self.assertRaises(exceptions.NotFound, self.client.get_token,
                           subject_token)
 
-    @test.skip_because(bug="1351026")
     @test.attr(type='gate')
     def test_rescope_token(self):
         """Rescope a token.