Switch base unit test class to oslo mox fixture

This commit just removes the duplicate mox fixture created in
tempest.tests.base and instead uses the MoxStubout fixture from oslo.

Change-Id: I88e8aee86bba4a5ab458c57cb23cb0422f760733
diff --git a/tempest/tests/base.py b/tempest/tests/base.py
index 12c1c25..ba83cf4 100644
--- a/tempest/tests/base.py
+++ b/tempest/tests/base.py
@@ -17,24 +17,9 @@
 import os
 
 import fixtures
-import mox
-import stubout
 import testtools
 
-
-class MoxStubout(fixtures.Fixture):
-    """Deal with code around mox and stubout as a fixture."""
-
-    def setUp(self):
-        super(MoxStubout, self).setUp()
-        # emulate some of the mox stuff, we can't use the metaclass
-        # because it screws with our generators
-        self.mox = mox.Mox()
-        self.stubs = stubout.StubOutForTesting()
-        self.addCleanup(self.stubs.UnsetAll)
-        self.addCleanup(self.stubs.SmartUnsetAll)
-        self.addCleanup(self.mox.UnsetStubs)
-        self.addCleanup(self.mox.VerifyAll)
+from tempest.openstack.common.fixture import moxstubout
 
 
 class TestCase(testtools.TestCase):
@@ -50,6 +35,6 @@
             stderr = self.useFixture(fixtures.StringStream('stderr')).stream
             self.useFixture(fixtures.MonkeyPatch('sys.stderr', stderr))
 
-        mox_fixture = self.useFixture(MoxStubout())
+        mox_fixture = self.useFixture(moxstubout.MoxStubout())
         self.mox = mox_fixture.mox
         self.stubs = mox_fixture.stubs