Until now, view updates were generated with a bunch of random
time points, because the interface was not adjusted for passing
a single time point. The time points were used to determine
whether cells were alive (e.g. because of TTL), so it's better
to unify the process:
1. when generating view updates from user writes, a single time point
is used for the whole operation
2. when generating view updates via the view building process,
a single time point is used for each build step
NOTE: I don't see any reliable and deterministic way of writing
test scenarios which trigger problems with the old code.
After #6488 is resolved and error injection is integrated
into view.cc, tests can be added.
Fixes#6429
Tests: unit(dev)
Message-Id: <f864e965eb2e27ffc13d50359ad1e228894f7121.1590070130.git.sarna@scylladb.com>
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