Remove Paste from the dependencies

We don't use it anymore. We use aiohttp.

Change-Id: Iad3aa9421e8a317941a5f252bda9817806caee93
diff --git a/tests/base.py b/tests/base.py
index be8c17b..013a6e1 100755
--- a/tests/base.py
+++ b/tests/base.py
@@ -1857,7 +1857,7 @@
         # from libraries that zuul depends on such as gear.
         log_defaults_from_env = os.environ.get(
             'OS_LOG_DEFAULTS',
-            'git.cmd=INFO,kazoo.client=WARNING,gear=INFO,paste=INFO')
+            'git.cmd=INFO,kazoo.client=WARNING,gear=INFO')
 
         if log_defaults_from_env:
             for default in log_defaults_from_env.split(','):