Several modules use "!= None" instead of "is not None"

[Jason Kölker]

$ grep -R "!= None" *
nova/auth/dbdriver.py: if member_uids != None:
nova/api/ec2/apirequest.py: elif data != None:
nova/virt/libvirt_conn.py: if ctx != None:
nova/virt/libvirt_conn.py: if doc != None:
nova/virt/libvirt_conn.py: if ctx != None:
nova/virt/libvirt_conn.py: if doc != None:
nova/virt/libvirt_conn.py: if ctx != None:
nova/virt/libvirt_conn.py: if doc != None:
nova/compute/monitor.py: if data != None:
nova/tests/api/openstack/test_servers.py: if host != None:
nova/db/sqlalchemy/api.py: filter(models.FixedIp.instance_id != None).\
nova/db/sqlalchemy/api.py: filter(models.FixedIp.instance_id != None).\
nova/db/sqlalchemy/api.py: return group != None
nova/utils.py: if process_input != None:
tools/esx/guest_tool.py: if process_input != None:

[Jason Kölker (jason-koelker)]

These are correct per http://www.sqlalchemy.org/docs/orm/tutorial.html#common-filter-operators

nova/db/sqlalchemy/api.py: filter(models.FixedIp.instance_id != None).\
nova/db/sqlalchemy/api.py: filter(models.FixedIp.instance_id != None).\