Update xrootd to version 4.5.0

[cmsbuild]

backport of #2648

[cmsbuild]

A new Pull Request was created by @cmsbuild for branch IB/CMSSW_8_1_X/gcc530.

@cmsbuild, @smuzaffar, @iahmad-khan, @davidlange6 can you please review it and eventually sign? Thanks.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.

[smuzaffar]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/cmsdist-test-pr/451/console

[cmsbuild]

-1

Tested at: 291be02

You can see the results of the tests here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2733/451/summary.html

I found follow errors while testing this PR

Failed tests: UnitTests

• Unit Tests:

I found errors in the following unit tests:

---> test testRecoMETMETProducers had ERRORS

[cmsbuild]

Comparison job queued.

[smuzaffar]

+externals

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_8_1_X/gcc530 IBs (but tests are reportedly failing). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @smuzaffar

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2733/451/summary.html