[DRE-maint] Bug#691236: gem2deb should not add non ruby test files to ruby-test-files.yaml

[Praveen A]

package: gem2deb
severity: normal

It caused multipart-post to fail running tests. see
https://github.com/nicksieger/multipart-post/issues/19 fix was to
remove offending file from ruby-test-files.yaml
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