Dmitry Shulyak aa28f652e3 Re-send user payload if previously sent envelope wasn't acknowledged (#1386)
* Split shhext.tracker into envelopes and mail monitors

* Send envelopes on every new attempt to deliver a message

* Re-send user payloads if previous envelopes weren't acknowledged

* Remove debug api across the codebase
2019-03-01 14:36:21 +01:00
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