[kudu-CR] mini-cluster: support parallel multi-master clusters

["Dan Burkert (Code Review)" <ge...@cloudera.org>]

Hello Tidy Bot, Kudu Jenkins, Adar Dembo, 

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

    http://gerrit.cloudera.org:8080/8280

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

Change subject: mini-cluster: support parallel multi-master clusters
......................................................................

mini-cluster: support parallel multi-master clusters

This commit refactors the mini-clusters to internally use reserved
sockets for their child daemons. Reserved sockets are simply sockets
bound to a random port with SO_REUSEPORT. This allows for a few
simplifications:

* master addresses in multi-master clusters can be reserved up-front,
  which removes any chance of a race condition in binding. As a result,
  multi-master clusters no longer need hard-coded ports, and tests using
  multi-master clusters no longer need to run in sequence.

WIP: This commit removes the ability to set the desired master ports.
master_migration-itest relies on this functionality, so it's currently
broken.

Change-Id: I0b0ff7bfc179d8fdb1ed306d1bbd12acddeb060c
---
M src/kudu/client/client-test.cc
M src/kudu/integration-tests/CMakeLists.txt
M src/kudu/integration-tests/catalog_manager_tsk-itest.cc
M src/kudu/integration-tests/client-negotiation-failover-itest.cc
M src/kudu/integration-tests/client-stress-test.cc
M src/kudu/integration-tests/master-stress-test.cc
M src/kudu/integration-tests/master_cert_authority-itest.cc
M src/kudu/integration-tests/master_failover-itest.cc
M src/kudu/integration-tests/master_migration-itest.cc
M src/kudu/integration-tests/master_replication-itest.cc
M src/kudu/integration-tests/security-faults-itest.cc
M src/kudu/integration-tests/security-itest.cc
M src/kudu/integration-tests/security-master-auth-itest.cc
M src/kudu/integration-tests/token_signer-itest.cc
M src/kudu/integration-tests/webserver-stress-itest.cc
M src/kudu/master/mini_master.cc
M src/kudu/mini-cluster/CMakeLists.txt
M src/kudu/mini-cluster/external_mini_cluster-test.cc
M src/kudu/mini-cluster/external_mini_cluster.cc
M src/kudu/mini-cluster/external_mini_cluster.h
M src/kudu/mini-cluster/internal_mini_cluster.cc
M src/kudu/mini-cluster/internal_mini_cluster.h
M src/kudu/mini-cluster/mini_cluster.cc
M src/kudu/mini-cluster/mini_cluster.h
M src/kudu/tools/CMakeLists.txt
M src/kudu/tools/ksck_remote-test.cc
M src/kudu/tools/tool_action_test.cc
27 files changed, 170 insertions(+), 276 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/80/8280/3
-- 
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I0b0ff7bfc179d8fdb1ed306d1bbd12acddeb060c
Gerrit-Change-Number: 8280
Gerrit-PatchSet: 3
Gerrit-Owner: Dan Burkert <da...@apache.org>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Dan Burkert <da...@apache.org>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Tidy Bot