Fix a bazillion tests with ANSI sql_mode, and get rid of a bunch of MySQLDump usage.

sandbox/start-sandbox

@@ -48,6 +48,9 @@ make_sandbox() {
    if [ -n "$MODE_ANSI" ]; then
       echo "sql_mode=ansi" >> /tmp/$port/my.sandbox.cnf
    fi
+   if [ -n "$MULTIPLE_BUFFER_POOLS" ]; then
+      echo "innodb_buffer_pool_instances=$MULTIPLE_BUFFER_POOLS" >> /tmp/$port/my.sandbox.cnf
+   fi
 
    # If the sandbox is a slave, set it read_only.
    if [ "$type" = "slave" ]; then