Factorise PreSplitting configuration from InitialStep

[rovere]

Completely factorize PreSplitting from InitialStep configuration, so that they can be tuned independently. Fix order of python import logic. No regression expected.

See also #10580 e #10583

[cmsbuild]

A new Pull Request was created by @rovere (Marco Rovere) for CMSSW_7_5_X.

Factorise PreSplitting configuration from InitialStep

It involves the following packages:

RecoTracker/IterativeTracking

@cmsbuild, @cvuosalo, @slava77 can you please review it and eventually sign? Thanks.
@ghellwig, @makortel, @GiacomoSguazzoni, @VinInn, @mschrode, @istaslis, @gpetruc, @cerati, @dgulhan this is something you requested to watch as well.
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[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 409c3dc
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10584/6987/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10584/6987/summary.html

[cvuosalo]

+1

For #10584 409c3dc

For Tracking, factorizing PreSplitting configuration from the InitialStep. This code improvement to facilitate tuning should have no effect on monitored quantities. The 74X and 76X versions of this PR, #10583 and #10580, have already been approved by Reco.

The code changes are satisfactory, and Jenkins tests against baseline CMSSW_7_5_X_2015-08-05-1100 show no significant differences, as expected. Correct inclusion of the code change into the config was verified for #10580.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs once checked with relvals in the development release cycle of CMSSW (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1