Implement handling of edm::shutdown_flag in online DQM sources

[dmitrijus]

The process now exits gracefully, the moment ctrl+c is pressed or on SIGUSR2.
Discussion: https://hypernews.cern.ch/HyperNews/CMS/get/dqmDevel/2359.html

[cmsbuild]

A new Pull Request was created by @dmitrijus (Dmitrijus) for CMSSW_9_0_X.

It involves the following packages:

DQMServices/StreamerIO

@cmsbuild, @dmitrijus, @vanbesien, @davidlange6 can you please review it and eventually sign? Thanks.
@barvic 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

[dmitrijus]

+1

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/17320/console Started: 2017/01/18 17:13

[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: 9b9c0be
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-17203/17320/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-17203/17320/summary.html

[davidlange6]

+1