Updating setstatus.py example to reflect deprecated API call

Via:
http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_objec
ts_user.htm

“This field is deprecated in API version 25.0. To achieve similar
behavior, post to the user directly by creating a FeedItem with the
user’s ParentId.”

This was returning “error updating
status:INVALID_FIELD_FOR_INSERT_UPDATE:User: bad field names on
insert/update call: CurrentStatus” for me on python 2.7.