Fix port calculation for TiDB versions to avoid invalid ports

The old calculation '34$(tr -d .)' produced 346512 for version 6.5.12,
which exceeds the maximum port number (65535).

New calculation: 34000 + (minor * 100) + patch
- 6.1.7 -> 34107
- 6.5.12 -> 34512
- 7.1.6 -> 34106
- 7.5.7 -> 34507
- 8.1.2 -> 34102
- 8.5.3 -> 34503

All ports are now valid (< 65535) and unique per version.

Author: zph

GNUmakefile

@@ -84,7 +84,7 @@ testrdsdb:
 	$(MAKE) testacc
 
 testtidb%:
-	$(MAKE) MYSQL_VERSION=$* MYSQL_PORT=34$(shell echo "$*" | tr -d '.') testtidb
+	$(MAKE) MYSQL_VERSION=$* MYSQL_PORT=$(shell echo "$*" | awk -F. '{port=34000+($$2*100)+$$3; if(port>65535) port=34000+($$2*10)+$$3; printf "%d", port}') testtidb
 
 # WARNING: this does not work as a bare task run, it only instantiates correctly inside the versioned TiDB task run
 #          otherwise MYSQL_PORT and version are unset.