Remove use of detailed-errors nose plugin

This conflicts with testtools and causes nose failures leading to lost
traceback information.

Part of blueprint grizzly/testtools

Change-Id: I131da4d2d2a965a4c4286c493f05980f27acd78d
diff --git a/setup.cfg b/setup.cfg
index c28d129..b522f3a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,7 +1,5 @@
 [nosetests]
 # NOTE(jkoelker) To run the test suite under nose install the following
 #                coverage http://pypi.python.org/pypi/coverage
-#                tissue http://pypi.python.org/pypi/tissue (pep8 checker)
 #                openstack-nose https://github.com/openstack-dev/openstack-nose
 verbosity=2
-detailed-errors=1