mendersoftware / mender / 1018307341

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fix: Wait repeatedly for I/O events on DBus file descriptors

ASIO's `stream_descriptor::async_read/wait/error()` all register
one-off handlers. We actually need to watch the given file
descriptors for all events until we cancel the watch.

We can do that by using functors re-registering themselves
whenever called.

Also, add a tip and commented code to DBus tests helping debug
DBus issues.

Ticket: MEN-6655
Changelog: none
Signed-off-by: Vratislav Podzimek <v.podzimek@mykolab.com>

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