5 seconds for the shared ros test is not enough

[Leo Arias]

5 seconds to set up, run and receive the message in the shared ros is sometimes not enough:

https://paste.ubuntu.com/24191610/

In that execution, 5 seconds was enough just to send the third message. And no message was received on the other side.

On this other execution, the 7th message was the first received: https://paste.ubuntu.com/24191611/

So, we should increase the timeout.

[Leo Arias (elopio)]

https://github.com/snapcore/snapcraft/pull/1197

[Sergio Schvezov (sergiusens)]

We changed it to 30s and still see timeouts on some runs. After a 2 hour run it is not nice to see a failure due to racy timeouts so I suggest we go the mosquitto route (maybe assign to Kyle).

[Kyle Fazzari (kyrofa)]

Here, this will make them more similar to the mosquitto demo and exit after a single message has been received: https://github.com/snapcore/snapcraft/pull/1201 .