[Request] Print suppressions from blacklist file

[bryanburke]

Currently, the flag to print rule suppressions does not print the rules suppressed via a blacklist file. Would it be possible for cfn_nag and cfn_nag_scan to include blacklisted rules in their suppressions output?

[ghost]

for whoever picks this one up... mechanics are probably pretty easy. either record what's going on in filter_violations_by_blacklist or take the intersect of the blacklist and the results at the point of showing results maybe? thing to keep in mind is that while it's probably fine to add to the text results, we need to add a field to the json results like blacklisted_rules