[kudu-CR] Implement a version migration test

["Mike Percy (Code Review)" <ge...@cloudera.org>]

Hello Kudu Jenkins,

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

    http://gerrit.cloudera.org:8080/4424

to look at the new patch set (#3).

Change subject: Implement a version migration test
......................................................................

Implement a version migration test

This program takes two binary directories and runs a simple "migration"
test between the two versions to ensure that a table created with
"Version A" of the software can be read by "Version B" of the software.
This can also be thought of as an "upgrade" or "downgrade" test.

This patch also makes some changes to ExternalMiniCluster and the cmake
files to allow for creating an executable that is written like a unit
test (using the Google Test framework) but is not automatically executed
by ctest.

As a follow-up, we would benefit from a higher-level script that can
manage upgrade and downgrade testing across many versions of Kudu.

Change-Id: I2831b47e6c0b644a256e1914fa495f453318e0cd
---
M CMakeLists.txt
M src/kudu/integration-tests/CMakeLists.txt
M src/kudu/integration-tests/external_mini_cluster.cc
M src/kudu/integration-tests/external_mini_cluster.h
A src/kudu/integration-tests/version_migration-test.cc
5 files changed, 161 insertions(+), 5 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/24/4424/3
-- 
To view, visit http://gerrit.cloudera.org:8080/4424
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I2831b47e6c0b644a256e1914fa495f453318e0cd
Gerrit-PatchSet: 3
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Dinesh Bhat <di...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Tidy Bot
Gerrit-Reviewer: Will Berkeley <wd...@gmail.com>