MDEV-34437 restrict port and extra-port to tcp valid values

extra_port and port are 16 bit numbers and not 32 bit as they are
tcp ports.

Restrict their value.

mysql-test/suite/sys_vars/r/sysvars_server_embedded.result

@@ -957,7 +957,7 @@ VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	INT UNSIGNED
 VARIABLE_COMMENT	Extra port number to use for tcp connections in a one-thread-per-connection manner. 0 means don't use another port
 NUMERIC_MIN_VALUE	0
-NUMERIC_MAX_VALUE	4294967295
+NUMERIC_MAX_VALUE	65535
 NUMERIC_BLOCK_SIZE	1
 ENUM_VALUE_LIST	NULL
 READ_ONLY	YES
@@ -2777,7 +2777,7 @@ VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	INT UNSIGNED
 VARIABLE_COMMENT	Port number to use for connection or 0 to default to, my.cnf, $MYSQL_TCP_PORT, /etc/services, built-in default (3306), whatever comes first
 NUMERIC_MIN_VALUE	0
-NUMERIC_MAX_VALUE	4294967295
+NUMERIC_MAX_VALUE	65535
 NUMERIC_BLOCK_SIZE	1
 ENUM_VALUE_LIST	NULL
 READ_ONLY	YES

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -977,7 +977,7 @@ VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	INT UNSIGNED
 VARIABLE_COMMENT	Extra port number to use for tcp connections in a one-thread-per-connection manner. 0 means don't use another port
 NUMERIC_MIN_VALUE	0
-NUMERIC_MAX_VALUE	4294967295
+NUMERIC_MAX_VALUE	65535
 NUMERIC_BLOCK_SIZE	1
 ENUM_VALUE_LIST	NULL
 READ_ONLY	YES
@@ -2937,7 +2937,7 @@ VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	INT UNSIGNED
 VARIABLE_COMMENT	Port number to use for connection or 0 to default to, my.cnf, $MYSQL_TCP_PORT, /etc/services, built-in default (3306), whatever comes first
 NUMERIC_MIN_VALUE	0
-NUMERIC_MAX_VALUE	4294967295
+NUMERIC_MAX_VALUE	65535
 NUMERIC_BLOCK_SIZE	1
 ENUM_VALUE_LIST	NULL
 READ_ONLY	YES

sql/sys_vars.cc

@@ -2798,7 +2798,7 @@ static Sys_var_uint Sys_port(
 #endif
        "built-in default (" STRINGIFY_ARG(MYSQL_PORT) "), whatever comes first",
        READ_ONLY GLOBAL_VAR(mysqld_port), CMD_LINE(REQUIRED_ARG, 'P'),
-       VALID_RANGE(0, UINT_MAX32), DEFAULT(0), BLOCK_SIZE(1));
+       VALID_RANGE(0, UINT_MAX16), DEFAULT(0), BLOCK_SIZE(1));
 
 static Sys_var_ulong Sys_preload_buff_size(
        "preload_buffer_size",
@@ -6244,7 +6244,7 @@ static Sys_var_uint Sys_extra_port(
        "Extra port number to use for tcp connections in a "
        "one-thread-per-connection manner. 0 means don't use another port",
        READ_ONLY GLOBAL_VAR(mysqld_extra_port), CMD_LINE(REQUIRED_ARG),
-       VALID_RANGE(0, UINT_MAX32), DEFAULT(0), BLOCK_SIZE(1));
+       VALID_RANGE(0, UINT_MAX16), DEFAULT(0), BLOCK_SIZE(1));
 
 static Sys_var_on_access_global<Sys_var_ulong,
                               PRIV_SET_SYSTEM_GLOBAL_VAR_EXTRA_MAX_CONNECTIONS>