send-email: try to get fqdn by running hostname -f on Linux and macOS

`hostname` is a popular command available on both Linux and macOS. As
per the man-page[1], `hostname -f` command returns the fully qualified
domain name (FQDN) of the system. The current Net::Domain perl module
being used in the script for the same has been quite unrealiable in many
cases. Thankfully, we now have a better check for valid_fqdn, which does
reject the invalid FQDNs given by this module properly, but at the same
time, it will result in a fallback to 'localhost.localdomain' being
used. `hostname -f` has been quite reliable (probably even more reliable
than the Net::Domain module) and before falling back to
'localhost.localdomain', we should try to use it. Interestingly, the
`hostname` command is actually used by perl modules like Net::Domain[2]
and Sys::Hostname[3] to get the hostname. So, lets give `hostname -f` a
chance as well!

[1]: https://man7.org/linux/man-pages/man1/hostname.1.html
[2]: https://github.com/Perl/perl5/blob/blead/cpan/libnet/lib/Net/Domain.pm#L88
[3]: https://github.com/Perl/perl5/blob/blead/ext/Sys-Hostname/Hostname.pm#L93

Signed-off-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: AdityaGarg8

git-send-email.perl

@@ -1386,8 +1386,22 @@ sub maildomain_mta {
 	return $maildomain;
 }
 
+sub maildomain_hostname_command {
+	my $maildomain;
+
+	if ($^O eq 'linux' || $^O eq 'darwin') {
+		my $domain = `(hostname -f) 2>/dev/null`;
+		if (!$?) {
+			chomp($domain);
+			$maildomain = $domain if valid_fqdn($domain);
+		}
+	}
+	return $maildomain;
+}
+
 sub maildomain {
-	return maildomain_net() || maildomain_mta() || 'localhost.localdomain';
+	return maildomain_net() || maildomain_mta() ||
+		maildomain_hostname_command || 'localhost.localdomain';
 }
 
 sub smtp_host_string {