In basebackup_to_shell tests, properly set up pg_hba.conf.

Discussion: http://postgr.es/m/485495.1648692468@sss.pgh.pa.us

contrib/basebackup_to_shell/t/001_basic.pl

@@ -17,7 +17,12 @@ if (!defined $gzip || $gzip eq '')
 }
 
 my $node = PostgreSQL::Test::Cluster->new('primary');
-$node->init('allows_streaming' => 1);
+
+# Make sure pg_hba.conf is set up to allow connections from backupuser.
+# This is only needed on Windows machines that don't use UNIX sockets.
+$node->init('allows_streaming' => 1,
+			'auth_extra' => [ '--create-role', 'backupuser' ]);
+
 $node->append_conf('postgresql.conf',
 				   "shared_preload_libraries = 'basebackup_to_shell'");
 $node->start;