tests -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci

This fixes:
MDEV-7693 MariaDB - mysql-test - SUITE:funcs_1 - funcs_1.is_tables_mysql is failing on TABLE_COLLATION /DATABASE_COLLATION
MDEV-8487 mysql-test - main.information_schema 'xtradb' fails
MDEV-8486 mysql-test - main.bootstrap fails

mysql-test/mysql-test-run.pl

@@ -3638,7 +3638,7 @@ sub mysql_install_db {
 
   # Create mtr database
   mtr_tofile($bootstrap_sql_file,
-	     "CREATE DATABASE mtr;\n");
+	     "CREATE DATABASE mtr CHARSET=latin1;\n");
 
   # Add help tables and data for warning detection and supression
   mtr_tofile($bootstrap_sql_file,

mysql-test/r/mysqld--help.result

@@ -1079,10 +1079,8 @@ binlog-stmt-cache-size 32768
 bulk-insert-buffer-size 8388608
 character-set-client-handshake TRUE
 character-set-filesystem binary
-character-set-server latin1
 character-sets-dir MYSQL_CHARSETSDIR/
 chroot (No default value)
-collation-server latin1_swedish_ci
 completion-type NO_CHAIN
 concurrent-insert AUTO
 console FALSE

mysql-test/t/bootstrap.test

@@ -79,7 +79,7 @@ EOF
 #
 --write_file $MYSQLTEST_VARDIR/tmp/bootstrap_plugins.sql
 use test;
-create table t1(a int) engine=example;
+create table t1(a int) engine=example charset=latin1;
 EOF
 --exec $MYSQLD_BOOTSTRAP_CMD --plugin-dir=$PLUGIN_DIR < $MYSQLTEST_VARDIR/tmp/bootstrap_plugins.sql >> $MYSQLTEST_VARDIR/tmp/bootstrap.log 2>&1
 --remove_file $MYSQLTEST_VARDIR/tmp/bootstrap_plugins.sql

mysql-test/t/mysqld--help.test

@@ -22,6 +22,7 @@ perl;
                log-slow-queries pid-file slow-query-log-file log-basename
                datadir slave-load-tmpdir tmpdir socket thread-pool-size
                large-files-support lower-case-file-system system-time-zone
+               collation-server character-set-server
                version.*/;
 
   # Plugins which may or may not be there:

scripts/mysql_system_tables.sql

@@ -229,7 +229,7 @@ SET @cmd= "CREATE TABLE IF NOT EXISTS gtid_slave_pos (
   sub_id BIGINT UNSIGNED NOT NULL,
   server_id INT UNSIGNED NOT NULL,
   seq_no BIGINT UNSIGNED NOT NULL,
-  PRIMARY KEY (domain_id, sub_id))
+  PRIMARY KEY (domain_id, sub_id)) CHARSET=latin1
 COMMENT='Replication slave GTID position'";
 SET @str=CONCAT(@cmd, ' ENGINE=', @innodb_or_myisam);
 PREPARE stmt FROM @str;

tests/mysql_client_test.c

@@ -2261,7 +2261,7 @@ static void test_ps_query_cache()
     return;
   }
 
-  rc= mysql_query(mysql, "SET SQL_MODE=''");
+  rc= mysql_set_character_set(mysql, "utf8");
   myquery(rc);
 
   /* prepare the table */
@@ -2306,7 +2306,7 @@ static void test_ps_query_cache()
         mysql_close(lmysql);
         DIE_UNLESS(0);
       }
-      rc= mysql_query(lmysql, "SET SQL_MODE=''");
+      rc= mysql_set_character_set(lmysql, "utf8");
       myquery(rc);
 
       if (!opt_silent)
@@ -16647,7 +16647,7 @@ static void test_bug30472()
 
   /* Switch client character set. */
 
-  DIE_IF(mysql_set_character_set(&con, "utf8"));
+  DIE_IF(mysql_set_character_set(&con, "latin2"));
 
   /* Retrieve character set information. */
 
@@ -16663,10 +16663,10 @@ static void test_bug30472()
       2) new character set is different from the original one.
   */
 
-  DIE_UNLESS(strcmp(character_set_name_2, "utf8") == 0);
-  DIE_UNLESS(strcmp(character_set_client_2, "utf8") == 0);
-  DIE_UNLESS(strcmp(character_set_results_2, "utf8") == 0);
-  DIE_UNLESS(strcmp(collation_connnection_2, "utf8_general_ci") == 0);
+  DIE_UNLESS(strcmp(character_set_name_2, "latin2") == 0);
+  DIE_UNLESS(strcmp(character_set_client_2, "latin2") == 0);
+  DIE_UNLESS(strcmp(character_set_results_2, "latin2") == 0);
+  DIE_UNLESS(strcmp(collation_connnection_2, "latin2_general_ci") == 0);
 
   DIE_UNLESS(strcmp(character_set_name_1, character_set_name_2) != 0);
   DIE_UNLESS(strcmp(character_set_client_1, character_set_client_2) != 0);