Remove deprecated skip_unless_attr decorator

This patch aims to remove 'skip_unless_attr' decorator, which marked as
deprecated and would be removed in Queens.

Change-Id: I33fb4466df2747fdbbf023373e53079a99a4d2c2

releasenotes/notes/remove-deprecated-skip_unless_attr-decorator-02bde59a00328f5c.yaml

@@ -0,0 +1,4 @@
+---
+upgrade:
+  - |
+    Remove the deprecated decorator ``skip_unless_attr`` in lib/decorators.py.

tempest/lib/decorators.py

@@ -15,7 +15,6 @@
 import functools
 import uuid
 
-import debtcollector.removals
 from oslo_log import log as logging
 import six
 import testtools
@@ -87,25 +86,6 @@ def idempotent_id(id):
     return decorator
 
 
-@debtcollector.removals.remove(removal_version='Queen')
-class skip_unless_attr(object):
-    """Decorator to skip tests if a specified attr does not exists or False"""
-    def __init__(self, attr, msg=None):
-        self.attr = attr
-        self.message = msg or ("Test case attribute %s not found "
-                               "or False") % attr
-
-    def __call__(self, func):
-        @functools.wraps(func)
-        def _skipper(*args, **kw):
-            """Wrapped skipper function."""
-            testobj = args[0]
-            if not getattr(testobj, self.attr, False):
-                raise testtools.TestCase.skipException(self.message)
-            func(*args, **kw)
-        return _skipper
-
-
 def attr(**kwargs):
     """A decorator which applies the testtools attr decorator
 

tempest/tests/lib/test_decorators.py

@@ -125,35 +125,6 @@ class TestIdempotentIdDecorator(base.TestCase):
         self.assertRaises(ValueError, self._test_helper, _id)
 
 
-class TestSkipUnlessAttrDecorator(base.TestCase):
-    def _test_skip_unless_attr(self, attr, expected_to_skip=True):
-        class TestFoo(test.BaseTestCase):
-            expected_attr = not expected_to_skip
-
-            @decorators.skip_unless_attr(attr)
-            def test_foo(self):
-                pass
-
-        t = TestFoo('test_foo')
-        if expected_to_skip:
-            self.assertRaises(testtools.TestCase.skipException,
-                              t.test_foo)
-        else:
-            try:
-                t.test_foo()
-            except Exception:
-                raise testtools.TestCase.failureException()
-
-    def test_skip_attr_does_not_exist(self):
-        self._test_skip_unless_attr('unexpected_attr')
-
-    def test_skip_attr_false(self):
-        self._test_skip_unless_attr('expected_attr')
-
-    def test_no_skip_for_attr_exist_and_true(self):
-        self._test_skip_unless_attr('expected_attr', expected_to_skip=False)
-
-
 class TestRelatedBugDecorator(base.TestCase):
     def test_relatedbug_when_no_exception(self):
         f = mock.Mock()