Fixed a bunch of typos throughout Neutron

Went through all of the docstrings in Neutron and did
some cleanup.  I'm sure there are bunch more that I have missed.

Change-Id: Ib29d2de1c580880c89ed4fd069e1515d0977a3e7
diff --git a/neutron/tests/tempest/common/waiters.py b/neutron/tests/tempest/common/waiters.py
index 7d97d5d..caa9b37 100644
--- a/neutron/tests/tempest/common/waiters.py
+++ b/neutron/tests/tempest/common/waiters.py
@@ -50,7 +50,7 @@
                     return
                 # NOTE(afazekas): The instance is in "ready for action state"
                 # when no task in progress
-                # NOTE(afazekas): Converted to string bacuse of the XML
+                # NOTE(afazekas): Converted to string because of the XML
                 # responses
                 if str(task_state) == "None":
                     # without state api extension 3 sec usually enough