Changes to consumes interface and getByToken for TrackerSeedGenerator

[thspeer]

Update of #1811 with rebase, there were conflicts with the Muon PR

[cmsbuild]

A new Pull Request was created by @thspeer for CMSSW_7_0_X.

Changes to consumes interface and getByToken for TrackerSeedGenerator

It involves the following packages:

RecoMuon/TrackerSeedGenerator
RecoPixelVertexing/PixelTrackFitting
RecoTracker/ConversionSeedGenerators
RecoTracker/SpecialSeedGenerators
RecoTracker/TkSeedGenerator

@nclopezo, @cmsbuild, @anton-a, @thspeer, @slava77 can you please review it and eventually sign? Thanks.
@ghellwig, @GiacomoSguazzoni, @rovere, @gpetruc, @cerati, @bachtis 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.
@ktf you are the release manager for this.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-1849/1829/summary.html

[thspeer]

+1
Tested 10a2578 in CMSSW_7_0_X_2013-12-18-0200_1849
No difference in reco as expected, based on RelMon and reco script

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IBs unless changes (tests are also fine). @ktf can you please take care of it?