Fix Frontier connection string in online DQM

[diguida]

Use the local squid cache instead of querying directly the frontier servlets.

[cmsbuild]

A new Pull Request was created by @diguida (Salvatore Di Guida) for CMSSW_7_4_X.

Fix Frontier connection string in online DQM

It involves the following packages:

DQM/Integration

@cmsbuild, @danduggan, @nclopezo, @deguio can you please review it and eventually sign? Thanks.
@threus, @batinkov this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[deguio]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs unless changes or unless it breaks tests. This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @ktf, @smuzaffar

[davidlange6]

+1

[cmsbuild]

+1
Tested at: 7da4c83
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8264/2369/summary.html