[kudu-CR] KUDU-1991. master: Retry background tasks even if TS UUID not registered

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

Hello Kudu Jenkins,

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

    http://gerrit.cloudera.org:8080/6534

to look at the new patch set (#4).

Change subject: KUDU-1991. master: Retry background tasks even if TS UUID not registered
......................................................................

KUDU-1991. master: Retry background tasks even if TS UUID not registered

Before this patch, if a master had just started up and got a message
from a tablet server that would require some action in response (for
example, deleting an evicted replica or replacing a replica in an
under-replicated tablet) then if an affected tablet server had not
registered with the master the task would fail and would not be retried.
This patch causes the task to be retried even if the initial tablet
server UUID lookup fails.

This change is tested by
AdminCliTest.TestUnsafeChangeConfigOnSingleFollower, which prior to this
patch was flaky (7/200 tests failed on dist-test before the patch).
After the changes to that test, it requires the above master fix to pass
but is no longer flaky (200/200 passed on dist-test).

Change-Id: I3a3de7fe87266f11392fd3bb0c74f19ad803de9d
---
M src/kudu/integration-tests/cluster_itest_util.cc
M src/kudu/integration-tests/cluster_itest_util.h
M src/kudu/master/catalog_manager.cc
M src/kudu/tools/kudu-admin-test.cc
4 files changed, 102 insertions(+), 61 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/34/6534/4
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I3a3de7fe87266f11392fd3bb0c74f19ad803de9d
Gerrit-PatchSet: 4
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Tidy Bot