SanitizePasswordsProcessor doesn't sanitize request params when request appears in local in a stack trace

[gavinwahl]

SanititizePasswordsProcessor sanitizes request parameters in the structured request dict, but not when request is a local variable in the stack trace. Sentry shows the repr of the local variables, and you end up with with the request parameters there:

<WSGIRequest
path:/checkout/,
GET:<QueryDict: {}>,
POST:<QueryDict: {u'cc_number': [u'4111111111111111'], u'cc_lastname':...

[dcramer]

The only solution I have here is to install a custom serializer for WSGIRequest. The server will def filter out the value if the CC number is present, but I have no desire to try to make safe repr's for every arbitrary data structure.