* Add tests for message attribute validation in SNS
Fixes up bug in return value of
moto.sns.responses.SNSResponse._parse_message_attributes due to
accidental recycling of a variable.
* Fix test_sns.test_publish_to_http in py36 env
Http response is encoded as a byte string which json.loads can't handle.
* Add support for FilterPolicy to sns subscription set_filter_attributes
* Add basic support for sns message filtering
This adds support for exact string value matching along with AND/OR
logic as described here:
https://docs.aws.amazon.com/sns/latest/dg/message-filtering.html
It does not provide support for:
- Anything-but string matching
- Prefix string matching
- Numeric Value Matching
The above filter policies (if configured) will not match messages.
* envelop message when sendig from sns to sqs
* add test for publishing sns message to sqs
* specify separators options to json.dumps to avoid json bug in python2
* remove unused print
* replace time string for testing server mode
