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/credentials.py b/neutron/tests/tempest/common/credentials.py
index 9ae6ee8..9dfdff0 100644
--- a/neutron/tests/tempest/common/credentials.py
+++ b/neutron/tests/tempest/common/credentials.py
@@ -45,7 +45,7 @@
 
 # We want a helper function here to check and see if admin credentials
 # are available so we can do a single call from skip_checks if admin
-# creds area vailable.
+# creds are available.
 def is_admin_available():
     is_admin = True
     # If tenant isolation is enabled admin will be available
diff --git a/neutron/tests/tempest/common/isolated_creds.py b/neutron/tests/tempest/common/isolated_creds.py
index 5da24a9..163ce8a 100644
--- a/neutron/tests/tempest/common/isolated_creds.py
+++ b/neutron/tests/tempest/common/isolated_creds.py
@@ -297,7 +297,7 @@
             new_index = str(roles) + '-' + str(len(self.isolated_creds))
             self.isolated_creds[new_index] = exist_creds
             del self.isolated_creds[str(roles)]
-            # Handle isolated neutron resouces if they exist too
+            # Handle isolated neutron resources if they exist too
             if CONF.service_available.neutron:
                 exist_net = self.isolated_net_resources.get(str(roles))
                 if exist_net:
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