Fixed typos in nova, nova/api, nova/cells directory

This patchset fixes the typo errors in nova root(non recursively),
nova/api, nova/cells and nova/cmd directory.
TrivialFix

Change-Id: Id4e5dbeafb6fdb63bb733eef203a676f94143f32

nova/api/metadata/base.py

@@ -416,7 +416,7 @@ class InstanceMetadata(object):
                     device_metadata['mac'] = device.mac
                 elif isinstance(device, metadata_obj.DiskMetadata):
                     device_metadata['type'] = 'disk'
-                    # serial and path are optional paramenters
+                    # serial and path are optional parameters
                     if 'serial' in device:
                         device_metadata['serial'] = device.serial
                     if 'path' in device:

nova/api/openstack/compute/schemas/cells.py

@@ -33,7 +33,7 @@ create = {
                 # following parameters:
                 #  "qpid://<username>:<password>@<rpc_host>:<rpc_port>/"
                 #  or
-                #  "rabiit://<username>:<password>@<rpc_host>:<rpc_port>/"
+                #  "rabbit://<username>:<password>@<rpc_host>:<rpc_port>/"
                 # Then the url is stored into transport_url of cells table
                 # which is defined with String(255).
                 'username': {

nova/cells/messaging.py

@@ -159,7 +159,7 @@ class _BaseMessage(object):
         self.max_hop_count = max_hop_count
         self.is_broadcast = False
         self._append_hop()
-        # Each sub-class should set this when the message is inited
+        # Each sub-class should set this when the message is initialized
         self.next_hops = []
         self.resp_queue = None
         self.serializer = objects_base.NovaObjectSerializer()

nova/cmd/manage.py

@@ -687,7 +687,7 @@ class NetworkCommands(object):
 
         # The --disassociate-X are boolean options, but if they user
         # mistakenly provides a value, it will be used as a positional argument
-        # and be erroneously interepreted as some other parameter (e.g.
+        # and be erroneously interpreted as some other parameter (e.g.
         # a project instead of host value). The safest thing to do is error-out
         # with a message indicating that there is probably a problem with
         # how the disassociate modifications are being used.

nova/test.py

@@ -190,7 +190,7 @@ class TestCase(testtools.TestCase):
         self.useFixture(nova_fixtures.StandardLogging())
 
         # NOTE(sdague): because of the way we were using the lock
-        # wrapper we eneded up with a lot of tests that started
+        # wrapper we ended up with a lot of tests that started
         # relying on global external locking being set up for them. We
         # consider all of these to be *bugs*. Tests should not require
         # global external locking, or if they do, they should