[Issue #149] add option -S | --primary-slot-name

Author: gsmolk

src/pg_probackup.c

@@ -172,6 +172,7 @@ static ConfigOption cmd_options[] =
 	{ 'f', 'b', "backup-mode",		opt_backup_mode,	SOURCE_CMD_STRICT },
 	{ 'b', 'C', "smooth-checkpoint", &smooth_checkpoint,	SOURCE_CMD_STRICT },
 	{ 's', 'S', "slot",				&replication_slot,	SOURCE_CMD_STRICT },
+	{ 's', 'S', "primary-slot-name",&replication_slot,	SOURCE_CMD_STRICT },
 	{ 'b', 181, "temp-slot",		&temp_slot,			SOURCE_CMD_STRICT },
 	{ 'b', 182, "delete-wal",		&delete_wal,		SOURCE_CMD_STRICT },
 	{ 'b', 183, "delete-expired",	&delete_expired,	SOURCE_CMD_STRICT },