Bypass swupd cert check when retrieving mirror url

We call `swupd mirror` to get any configured mirror URL. This call won't
retrieve anything useful if the certificate check fails, e.g. if
Swupd_Root.pem is expired. For this lookup, add the swupd flags
--nosigcheck and --nosigcheck-latest to bypass the error message and
still get the configured mirror URL.

configure.ac

@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.69])
-AC_INIT([clr-network-troubleshooter],[12])
+AC_INIT([clr-network-troubleshooter],[13])
 AM_INIT_AUTOMAKE
 
 # Checks for programs.

scripts/clr-network-troubleshooter.in

@@ -249,7 +249,7 @@ sub check_mirror {
 	}
 
 	# Check for a configured mirror
-	my $swupd = `swupd mirror`;
+	my $swupd = `swupd mirror --nosigcheck --nosigcheck-latest`;
 	my ($version_url) = ($swupd =~ m/Version URL\s*:\s*(\S+)/);
 	my $test_url = $version_url;