Remove Eras.py imports from tracking

[makortel]

This PR is a follow-up to #16001 by removing all imports of Eras.py from tracking.

Tested in CMSSW_8_1_X_2016-10-02-2300, no changes expected. I checked with workflows 4.22,5.1,8.0,25.0,135.13,135.4,136.731,140.53,1000.0,1001.0,1325.0,1325.1,1325.2,1325.3,1325.4,1330.0,10021.0,10024.0,10024.1,10024.2,10024.3,10024.4,10024.5,10424.0,10624.0,10824.0,20024.0,20024.1,20424.1,22424.0 (those include all tracking-specific workflows) that there are no changes in the configuration dumps.

@rovere @VinInn @kpedro88

[cmsbuild]

A new Pull Request was created by @makortel (Matti Kortelainen) for CMSSW_8_1_X.

It involves the following packages:

Configuration/StandardSequences
DQM/TrackingMonitorSource
RecoTracker/IterativeTracking
Validation/RecoTrack

@cvuosalo, @dmitrijus, @cmsbuild, @franzoni, @slava77, @vanbesien, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @hdelanno, @GiacomoSguazzoni, @rovere, @VinInn, @Martin-Grunewald, @mschrode, @fioriNTU, @wmtford, @gpetruc, @idebruyn, @threus, @dgulhan this is something you requested to watch as well.
@slava77, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[VinInn]

@cmsbuild , please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/15514/console

[cmsbuild]

+1
Tested at: 6ed0fa9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-16086/15514/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-16086/15514/summary.html

[dmitrijus]

+1

[slava77]

+1

for #16086 6ed0fa9

• technical changes to refactor era imports
• jenkins tests pass and comparisons show no differences
• local check of short matrix workflows shows that expanded configs (python dumps) are the same