Another round of clang RecoVertex warnings / errors fixes

[ktf]

This is a rebase of @thspeer #3869 which included changes from DataFormats/Math which were not intended (yet) for the base CMSSW_7_1_X.

[cmsbuild]

A new Pull Request was created by @ktf (Giulio Eulisse) for CMSSW_7_1_X.

Another round of clang RecoVertex warnings / errors fixes

It involves the following packages:

RecoVertex/AdaptiveVertexFit
RecoVertex/BeamSpotProducer
RecoVertex/GhostTrackFitter
RecoVertex/KinematicFitPrimitives
RecoVertex/LinearizationPointFinders
RecoVertex/MultiVertexFit
RecoVertex/PrimaryVertexProducer
RecoVertex/TertiaryTracksVertexFinder
RecoVertex/TrimmedKalmanVertexFinder
RecoVertex/V0Producer

@nclopezo, @cmsbuild, @anton-a, @diguida, @rcastello, @slava77, @Degano, @thspeer can you please review it and eventually sign? Thanks.
@ferencek, @cerati, @GiacomoSguazzoni, @pvmulder, @rovere 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.
@nclopezo, @ktf you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[slava77]

is RecoVertex/TertiaryTracksVertexFinder actually used anywhere by anyone?

[VinInn]

Very good question!
If used, it needs a major "refurbishing"

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3873/1526/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3873/1526/summary.html

[slava77]

+1

for d6314f1
based on jenkins.

The only place where there was an actual bug fix is not used in reco (and probably by nobody else either)

[davidlange6]

nothing here should be under alca.. so bypassing