When feature flag message_containers is enabled, setting
```
message_interceptors.incoming.set_header_timestamp
```
wasn't respected anymore when a message is published via MQTT to a
stream and subsequently consumed via AMQP 0.9.1.
This commit ensures that AMQP 0.9.1 header timestamp_in_ms will be
set.
Note that we must not modify the AMQP 1.0 properties section when messages
are received via AMQP 1.0 and consumed via AMQP 1.0.
Also, message annoation keys not starting with "x-" are reserved.
awaitMatch(Guard, Expr, Timeout) reevaluates Expr until it matches
Guard up to Timeout milliseconds from now. It returns the matched
value, in the event said value is useful later in a test.
Additionally simplify an instance of ?assertEqual(true, ... to ?assert(
David Ansari
Rin Kuryloski
Michael Klishin
Alex Valiushko
Philip Kuryloski
Daniil Fedotov