test/alternator: increase timeout on Scylla boot
test/alternator: increase timeout on Scylla boot

The Alternator test boots Scylla to test against it. We set an arbitrary
timeout for this boot to succeed: 100 seconds. This 100 seconds is
significantly more than 25 seconds it takes on my laptop, and I though
we'll never reach it. But it turns out that in some setups - running the
very slow debug build on slow and overcommitted nodes - 100 seconds is
not enough.

So this patch doubles the timeout to 200 seconds.

Note that this "200 seconds" is just a timeout, and doesn't affect normal
runs: Both a successful boot and a failed boot are recognized as soon as
they happen, and we never unnecessarily wait the entire 200 seconds.

Fixes #6271.

Signed-off-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>
Message-Id: <20200422193920.17079-1-625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>

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