tests: prevent compare_output_test running on import.

tests/ansible/compare_output_test.py

@@ -6,7 +6,6 @@ import re
 import subprocess
 import tempfile
 
-
 LOG = logging.getLogger(__name__)
 
 suffixes = [
@@ -42,9 +41,10 @@ def run(s):
         return fp.read()
 
 
-logging.basicConfig(level=logging.DEBUG)
+if __name__ == '__main__':
+    logging.basicConfig(level=logging.DEBUG)
 
-for suffix in suffixes:
+    for suffix in suffixes:
         ansible = run('ansible localhost %s' % (suffix,))
         mitogen = run('ANSIBLE_STRATEGY=mitogen ansible localhost %s' % (suffix,))