[report] Ignore case when scrubbing via do_file_sub

File content substitutions done via do_file_sub will newly work case
insensitive. This simplifies detection and description of sensitive
content, while a risk to obfuscate a regular content is pretty low.

The change is followed by simplification of do_file_sub and
do_path_regex_sub calls in individual plugins, and also making them more
generic: bfuscated string should not contain explicit case-sensitive
key, but \1 rather, to prevent unintentional change of case of the key.

Closes: #3070
Resolves: #3156

Signed-off-by: Pavel Moravec <pmoravec@redhat.com>

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