Remove errant basicConfig calls in test suites

This made the test suite print everything to the default logger on
stderr, producing copious amounts of wasteful output.

Change-Id: I84b8caa64a7e0feff43af55f29597e011775871d
diff --git a/tests/unit/test_github_driver.py b/tests/unit/test_github_driver.py
index f2a6e5b..f918218 100644
--- a/tests/unit/test_github_driver.py
+++ b/tests/unit/test_github_driver.py
@@ -12,17 +12,12 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import logging
 import re
 from testtools.matchers import MatchesRegex
 import time
 
 from tests.base import ZuulTestCase, simple_layout, random_sha1
 
-logging.basicConfig(level=logging.DEBUG,
-                    format='%(asctime)s %(name)-32s '
-                    '%(levelname)-8s %(message)s')
-
 
 class TestGithubDriver(ZuulTestCase):
     config_file = 'zuul-github-driver.conf'
diff --git a/tests/unit/test_multi_driver.py b/tests/unit/test_multi_driver.py
index e38fc67..a1107de 100644
--- a/tests/unit/test_multi_driver.py
+++ b/tests/unit/test_multi_driver.py
@@ -13,13 +13,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import logging
 from tests.base import ZuulTestCase
 
-logging.basicConfig(level=logging.DEBUG,
-                    format='%(asctime)s %(name)-32s '
-                    '%(levelname)-8s %(message)s')
-
 
 class TestGerritAndGithub(ZuulTestCase):
     config_file = 'zuul-connections-gerrit-and-github.conf'