Typos.  A bunch of typos I've been collecting.

Change-Id: I53ab8d17914e6563110354e4052109ac02bf8f3b
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
diff --git a/test/test_pipe.py b/test/test_pipe.py
index 73d716f..d2f21ef 100644
--- a/test/test_pipe.py
+++ b/test/test_pipe.py
@@ -100,7 +100,7 @@
                                                self.pg1.sw_if_index,
                                                enable=1)
 
-        # test bi-drectional L2 flow pg0<->pg1
+        # test bi-directional L2 flow pg0<->pg1
         p = (Ether(src=self.pg0.remote_mac,
                    dst=self.pg1.remote_mac) /
              IP(src="1.1.1.1",