Silence pylint on Mac OSX 10.6

Also, increase the wait for socket binding to 0.2 seconds because OSX10.6 is
broken _and_ slow.

R=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/8749005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@112277 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/subprocess2.py b/subprocess2.py
index e65186e..99eebcc 100644
--- a/subprocess2.py
+++ b/subprocess2.py
@@ -182,7 +182,8 @@
     fix('stderr')
 
     self.start = time.time()
-
+    # Silence pylint on MacOSX
+    self.returncode = None
     try:
       super(Popen, self).__init__(args, **kwargs)
     except OSError, e: