[Piuparts-reports] detect_piuparts_issues

[piuparts master]

piuparts problem detected!
(By grep'ing for 'tar: .*.tar.gz: Cannot open: No such file or directory'
and for some python errors and tracebacks in failed logs.)

Please review the following logfiles/packages.
If it is always the same package failing, it's likely to be an issue in the
package.

removed `/srv/piuparts.debian.org/master/jessie/fail/r-cran-rpart_4.1-1-2.log'

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