[TD-319] change the length of fqdn from 72 to 256

src/inc/taosdef.h

@@ -218,7 +218,7 @@ void tsDataSwap(void *pLeft, void *pRight, int32_t type, int32_t size);
 #define TSDB_LOCALE_LEN           64
 #define TSDB_TIMEZONE_LEN         64
 
-#define TSDB_FQDN_LEN             72
+#define TSDB_FQDN_LEN             256
 #define TSDB_IPv4ADDR_LEN      	  16
 #define TSDB_FILENAME_LEN         128
 #define TSDB_METER_VNODE_BITS     20