Fix 'allowed' configuration construct to deduce also later types than just the first one

[makortel]

PR description:

While working with something else I came to wonder the indentation level of

            if chosenType is None:
                raise RuntimeError("Cannot convert "+str(value)+" to 'allowed' type")

in _AllowedParameterTypes.__call__(). It looked to me that the loop where the if is would execute exactly one iteration over the allowed types. Extending the unit tests to check also setting of one of the later types confirmed that this is indeed the case. This PR proposes to fix the problem by moving the check above to be done after the loop over types (which possibly was the intention).

In addition, I added tests to exercise the exception in ambiguous cases.

PR validation:

Framework unit tests run.

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-27784/11471

• This PR adds an extra 24KB to repository

[cmsbuild]

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

It involves the following packages:

FWCore/ParameterSet

@cmsbuild, @smuzaffar, @Dr15Jones can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @wddgit this is something you requested to watch as well.
@davidlange6, @slava77, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[makortel]

@cmsbuild, please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/2044/console Started: 2019/08/15 17:39

[cmsbuild]

+1
Tested at: ea8bf89
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-19bd98/2044/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-19bd98/2044/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 34
• DQMHistoTests: Total histograms compared: 2939508
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2939166
• DQMHistoTests: Total skipped: 341
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 33 files compared)
• Checked 142 log files, 14 edm output root files, 34 DQM output files

[Dr15Jones]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @davidlange6, @slava77, @smuzaffar, @fabiocos (and backports should be raised in the release meeting by the corresponding L2)

[kpedro88]

+1