Fixed Spider to follow THD ha_data protocol

Do not reset THD ha_data in spider_close_connection(), cleaner approach
is to let ha_close_connection() do it.

Part of MDEV-19515 - Improve connect speed

storage/spider/spd_table.cc

@@ -6576,7 +6576,7 @@ int spider_close_connection(
   }
 
   spider_rollback(spider_hton_ptr, thd, TRUE);
-  spider_free_trx(trx, TRUE);
+  spider_free_trx(trx, TRUE, false);
 
   DBUG_RETURN(0);
 }

storage/spider/spd_trx.cc

@@ -1557,7 +1557,8 @@ SPIDER_TRX *spider_get_trx(
 
 int spider_free_trx(
   SPIDER_TRX *trx,
-  bool need_lock
+  bool need_lock,
+  bool reset_ha_data
 ) {
   DBUG_ENTER("spider_free_trx");
   if (trx->thd)
@@ -1575,6 +1576,7 @@ int spider_free_trx(
       if (need_lock)
         pthread_mutex_unlock(&spider_allocated_thds_mutex);
     }
+    if (reset_ha_data)
       thd_set_ha_data(trx->thd, spider_hton_ptr, NULL);
   }
   spider_free_trx_alloc(trx);

storage/spider/spd_trx.h

@@ -80,7 +80,8 @@ SPIDER_TRX *spider_get_trx(
 
 int spider_free_trx(
   SPIDER_TRX *trx,
-  bool need_lock
+  bool need_lock,
+  bool reset_ha_data= true
 );
 
 int spider_check_and_set_trx_isolation(