Bug #15327: configure: --with-tcp-port option being partially ignored

make sure that if builder configured with a non-standard (!= 3306)
default TCP port that value actually gets used throughout. if they
didn't configure a value, assume "use a sensible default", which
will be read from /etc/services or, failing that, from the factory
default. That makes the order of preference
- command-line option
- my.cnf, where applicable
- $MYSQL_TCP_PORT environment variable
- /etc/services (unless configured --with-tcp-port)
- default port (--with-tcp-port=... or factory default)

mysql-test/mysql-test-run-shell.sh

@@ -17,7 +17,16 @@ USE_MANAGER=0
 MY_TZ=GMT-3
 TZ=$MY_TZ; export TZ # for UNIX_TIMESTAMP tests to work
 LOCAL_SOCKET=@MYSQL_UNIX_ADDR@
-MYSQL_TCP_PORT=@MYSQL_TCP_PORT@
+
+if [ -z "$MYSQL_TCP_PORT" ]; then
+  MYSQL_TCP_PORT=@MYSQL_TCP_PORT@
+  if [ @MYSQL_TCP_PORT_DEFAULT@ -eq 0 ]; then
+    ESP=`getent services mysql/tcp`
+    if [ $? -eq 0 ]; then
+      MYSQL_TCP_PORT=`echo "$ESP"|sed -e's-^[a-z]*[ ]*\([0-9]*\)/[a-z]*$-\1-g'`
+    fi
+  fi
+fi
 
 umask 022