[reporting] imrove readability of Six string workaround

Improve the readability of the changes to work around Six issue
emphasise the fact that the buffer contains line oriented data,
and introduce a helper function to test whether the string needs
the workaround to be applied or not: this shortens the list
comprehension which would otherwise overflow a single line due
to the longer buffer variable name.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>

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