Fix mistakes in recovery tests

One test was relying on method remove_tree that isn't implemented in the
oldest Perl we support; fix it by using the older rmtree instead.

Another test had a typo in a SQL command, which isn't noticed because
the PostgresNode->psql() method doesn't check that queries return
correctly.  That's undesirable and will also be fixed later on, but for
now let's make the test actually work.

Author: Craig Ringer

Author: alvherre

src/test/recovery/t/003_recovery_targets.pl

@@ -84,7 +84,7 @@ sub test_recovery_standby
 my $lsn4 =
   $node_master->psql('postgres', "SELECT pg_current_xlog_location();");
 $node_master->psql('postgres',
-	"SELECT pg_create_restore_point('$recovery_name'");
+	"SELECT pg_create_restore_point('$recovery_name');");
 
 # Force archiving of WAL file
 $node_master->psql('postgres', "SELECT pg_switch_xlog()");

src/test/recovery/t/004_timeline_switch.pl

@@ -3,7 +3,7 @@
 # on a new timeline.
 use strict;
 use warnings;
-use File::Path qw(remove_tree);
+use File::Path qw(rmtree);
 use PostgresNode;
 use TestLib;
 use Test::More tests => 1;
@@ -46,7 +46,7 @@
 $node_standby_1->promote;
 
 # Switch standby 2 to replay from standby 1
-remove_tree($node_standby_2->data_dir . '/recovery.conf');
+rmtree($node_standby_2->data_dir . '/recovery.conf');
 my $connstr_1 = $node_standby_1->connstr;
 $node_standby_2->append_conf(
 	'recovery.conf', qq(