update pythia8

[smuzaffar]

From @Dr15Jones :

• Make sure to delete the PDF objects Make sure to delete the PDF objects cms-externals/pythia8#9

[smuzaffar]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/27030/console
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/27033/console

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for branch IB/CMSSW_10_1_X/gcc630.

@cmsbuild, @smuzaffar, @gudrutis, @mrodozov can you please review it and eventually sign? Thanks.
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.

[cmsbuild]

+1
Tested at: 9cb198f
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3860/27033/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3860/27033/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 29
• DQMHistoTests: Total histograms compared: 2497880
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2497703
• DQMHistoTests: Total skipped: 176
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.950000000033 KiB( 23 files compared)
• Checked 118 log files, 9 edm output root files, 29 DQM output files