MDEV-8582: innodb_force_primary_key option does not force PK or unique key

Analysis: Handler used table flag HA_REQUIRE_PRIMARY_KEY but a bug on
sql_table.cc function mysql_prepare_create_table internally marked
secondary key with NOT NULL colums as unique key and did not then
fail on requirement that table should have primary key or unique key.

sql/sql_table.cc

@@ -4042,7 +4042,7 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
       my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0), key_info->name);
       DBUG_RETURN(TRUE);
     }
-    if (!(key_info->flags & HA_NULL_PART_KEY))
+    if (key->type == Key::UNIQUE && !(key_info->flags & HA_NULL_PART_KEY))
       unique_key=1;
     key_info->key_length=(uint16) key_length;
     if (key_length > max_key_length && key->type != Key::FULLTEXT)

storage/innobase/handler/ha_innodb.cc

@@ -11134,11 +11134,6 @@ index_bad:
 		}
 	}
 
-	if (srv_force_primary_key && form->s->primary_key >= MAX_KEY) {
-		my_error(ER_REQUIRES_PRIMARY_KEY, MYF(0));
-		DBUG_RETURN(false);
-	}
-
 	row_format = form->s->row_type;
 
 	if (create_info->key_block_size) {

storage/xtradb/handler/ha_innodb.cc

@@ -11645,11 +11645,6 @@ index_bad:
 		}
 	}
 
-	if (srv_force_primary_key && form->s->primary_key >= MAX_KEY) {
-		my_error(ER_REQUIRES_PRIMARY_KEY, MYF(0));
-		DBUG_RETURN(false);
-	}
-
 	row_format = form->s->row_type;
 
 	if (create_info->key_block_size) {