Fix bug in PVAssignment: missing abs for dxy

[arizzi]

This fixes the bug found by @VinInn of missing abs in PV association

Same PR will be made for 74X

[cmsbuild]

A new Pull Request was created by @arizzi for CMSSW_7_5_X.

Fix bug in PVAssignment: missing abs for dxy

It involves the following packages:

CommonTools/RecoAlgos

@cmsbuild, @cvuosalo, @nclopezo, @slava77 can you please review it and eventually sign? Thanks.
@ahinzmann, @jdolen, @rappoccio, @abbiendi, @jhgoh this is something you requested to watch as well.
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.
If you are a L2 or a release manager you can ask for tests by saying 'please test' in the first line of a comment.
@nclopezo you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[slava77]

@cmsbuild please test

[slava77]

@cmsbuild please test
trying one more time

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: fcd5dab
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8721/4201/summary.html

[slava77]

+1

for #8721 17da848
this is the same topic branch/the same code change as in #8722 prepared for 74X.

See that thread for the review discussion and approval summary.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs unless changes (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @nclopezo, @ktf, @smuzaffar

[davidlange6]

+1