Adding test of serial form of program.dat including pickles

[jglick]

Downstream of jenkinsci/jenkins-test-harness#352.

Motivation: jenkinsci/workflow-support-plugin#126 (comment)

strings on saved program.dat

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[dwnusbaum]

I think it would be interesting to add another test where program.dat exists but is corrupted, but the new test looks fine to me.

[dwnusbaum]

nit: Personally I prefer to use ZIP files with @LocalData so this kind of stuff does not come up in GitHub searches, but maybe you prefer doing things this way for other reasons.

[jglick]

come up in GitHub searches

Could be an issue I suppose. I normally prefer exploded $JENKINS_HOME because it is easier to review, and occasionally it even makes sense to change one line of one file, which in a ZIP would just be an opaque blob.

[jglick]

another test where program.dat exists but is corrupted

Could be interesting for certain purposes. The motivation here was unrelated—to verify that the existing format of current Pipeline builds using common steps can still be loaded even if we move the JBoss Marshalling code here from workflow-support, or change the file format to avoid the awkward pickle offset.