[kudu-CR] Add raft integration tests with duplicate keys

["David Ribeiro Alves (Code Review)" <ge...@cloudera.org>]

Hello Kudu Jenkins,

I'd like you to reexamine a change.  Please visit

    http://gerrit.cloudera.org:8080/5349

to look at the new patch set (#2).

Change subject: Add raft integration tests with duplicate keys
......................................................................

Add raft integration tests with duplicate keys

This splits the "crashy nodes" and "churny elections" tests
of raft_consensus-itest into unique and duplicate key variants.
This change is meant to stress any possible deadlock scenarios
related to transaction commit/abort and 2-phase locking for
which we didn't have much coverage.

Additionally this also disallows timeouts on writes and requires
an exact count of the rows at the end. This is now possible
due to exactly once semantics.

Finally this changes the cluster verifier to use snapshot scans
and changes the timeout of another scan in that test. These
two changes deflaked the test from 27/1000 to 3/1000 with
asan, slow mode, and 1 stress thread (any more and the test
becomes much more flaky, as before).

Change-Id: I6d018281d412ae034bd7b70c8311077a52b2795d
---
M src/kudu/integration-tests/cluster_verifier.cc
M src/kudu/integration-tests/raft_consensus-itest.cc
2 files changed, 120 insertions(+), 64 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/49/5349/2
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I6d018281d412ae034bd7b70c8311077a52b2795d
Gerrit-PatchSet: 2
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: David Ribeiro Alves <dr...@apache.org>
Gerrit-Reviewer: Kudu Jenkins