Fix periodic reports when log files are not compressed.

[nyan]

Summary

periodic: Fix periodic reports when log files are not compressed.

The modern zcat(1) is capable of handling compressed and uncompressed
text files, so we can simply use zcat command.

PR: 253168

[imp]

This is fine...
But maybe that function needs to be in a central location?
rc.subr seems the only place that might be accessible because periodic doesn't have a set of common routines, though there's a few in periodic.conf
Moving catmsgs likely should be considered, but might be out of scope for such a simple fix.

[delphij]

I don't think these whole case..esac blocks are needed: modern enough zcat(1) is capable of handling compressed and uncompressed text files, so you can simply do:

	    do
		zcat -f $f
	    done

and done with it...

In D43357#988243, @imp wrote:

This is fine...
But maybe that function needs to be in a central location?

This is already implemented in zcat(1) :)

[nyan]

delphij: Thanks you for your comment. I've updated my patch.

[delphij]

LGTM. Do we want to extract that catmsgs out to somewhere? (Not necessarily as part of this commit)