Reinstate prefetching provenance

[Dr15Jones]

The problem seen on the KNL system was determined to have no connection to the original pull request.

This pull request also makes a slight improvement on the original implementation.

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for CMSSW_9_0_X.

It involves the following packages:

FWCore/Integration
IOPool/Input
IOPool/Output

@cmsbuild, @smuzaffar, @Dr15Jones, @davidlange6 can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @wddgit, @wmtan this is something you requested to watch as well.
@davidlange6, @smuzaffar you are the release manager for this.

cms-bot commands are listed here #13028

[Dr15Jones]

please test

[Dr15Jones]

+1

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/17868/console Started: 2017/02/18 23:57

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_9_0_X IBs after it passes the integration tests. This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @smuzaffar

[cmsbuild]

-1

Tested at: 6f871b6

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
89950fe
1b23108
0e670d5
6d2be3d
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-17564/17868/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-17564/17868/git-merge-result

You can see the results of the tests here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-17564/17868/summary.html

I found follow errors while testing this PR

Failed tests: UnitTests

• Unit Tests:

I found errors in the following unit tests:

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
89950fe
1b23108
0e670d5
6d2be3d
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-17564/17868/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-17564/17868/git-merge-result

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-17564/17868/summary.html