storage: test: split archive format/compressor

detection into separate functions so they are reusable and easier
modifiable. This patch also adds the test for archive_info.

Signed-off-by: Alwin Antreich <a.antreich@proxmox.com>

test/run_plugin_tests.pl

@@ -0,0 +1,12 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use TAP::Harness;
+
+my $harness = TAP::Harness->new( { verbosity => -1 });
+my $res = $harness->runtests("archive_info_test.pm");
+
+exit -1 if !$res || $res->{failed} || $res->{parse_errors};
+