[insights] collect recursive listing of three dirs

[pmoravec]

Resolves: #3391
Closes: #3390

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[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo yum install -y dnf-plugins-core on RHEL 8
• sudo dnf install -y dnf-plugins-core on Fedora
• dnf copr enable packit/sosreport-sos-3391
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.

[TurboTurtle]

This looks fine, two thoughts though.

1. cmd_as_tag generates something like _bin_ls_[...] here, which is a bit odd to me, but perhaps it is fine since most tag consumers would be automation.
2. We've seen a handful of these types of collection requests recently, would it be desirable to add a wrapper to standardize these? E.G. self.add_dir_listing(['dir1', 'dir2']), which collects ls with a standard set of options and a standard tag syntax?

Neither of these are blockers, point 2 is just food for thought at the moment, and if Insights is fine with the cmd_as_tag style, then all good.