There's a case where the first query is lost due to the network just
starting up. To handle this we introduce a retry loop in the test case
that waits for a second query message to be sent.
In this commit we also lower the query interval to speed up the case
when the first message is lost. Ideally mcd (the underlying multicast
daemon) should implement a Startup Query Interval to send it even
faster.
Signed-off-by: Richard Alpe <richard@bit42.se>