MT#8623 set the repuser password only if the replication is already set

From MYSQL documentation:
"If you specify the MASTER_HOST or MASTER_PORT option, the slave
assumes that the master server is different from before
(even if the option value is the same as its current value.)
In this case, the old values for the master binary log file
name and position are considered no longer applicable"

Change-Id: I9be8e0fdab7ce598343df270c2ade0a5095e1f48

sbin/ngcp-sync-constants

@@ -165,6 +165,28 @@ SQL
 	$sth_master->finish;
 }
 
+sub set_master_pass {
+	my %args = @_;
+	my $dbh = $args{dbh};
+	my $user = $args{user};
+	my $pass = $args{pass};
+
+	my $sth_master = $dbh->prepare(<<SQL);
+CHANGE MASTER TO
+   MASTER_USER=?,
+   MASTER_PASSWORD=?;
+SQL
+	print " ---> update master info to master_user='$user', master_password='$pass'\n" if $debug;
+	$dbh->do('SLAVE STOP') unless $test_mode;
+	unless($test_mode) {
+		$sth_master->bind_param(1, $user);
+		$sth_master->bind_param(2, $pass);
+		$sth_master->execute();
+	};
+	$dbh->do('SLAVE START') unless $test_mode;
+	$sth_master->finish;
+}
+
 sub get_master_node {
 	my $mhost = get_nodename();
 
@@ -199,9 +221,8 @@ sub sync_repuser {
 		my @minfo_content = <$mfh>;
 		close $mfh;
 		unless(grep {/^${pass}\s*$/} @minfo_content) {
-			set_master(
+			set_master_pass(
 				dbh => $dbh,
-				host => $mhost,
 				user => $user, pass => $pass
 			);
 		} else {