MDEV-8508 mroonga fails embedded tests in 10.1

as a workaround until the bug is fixed
don't run mroonga tests in --embedded mode by default

storage/mroonga/mysql-test/mroonga/storage/suite.pm

@@ -5,7 +5,7 @@ package My::Suite::Mroonga;
 return "No Mroonga engine" unless $ENV{HA_MROONGA_SO} or
                                   $::mysqld_variables{'mroonga'} eq "ON";
 
-sub is_default { 1 }
+sub is_default { not $::opt_embedded_server }
 
 my $groonga_normalizer_mysql_dir=$::basedir . '/storage/mroonga/vendor/groonga/vendor/plugins/groonga-normalizer-mysql';
 my $groonga_normalizer_mysql_install_dir=$::basedir . '/lib/groonga/plugins';

storage/mroonga/mysql-test/mroonga/wrapper/suite.pm

@@ -5,7 +5,7 @@ package My::Suite::Mroonga;
 return "No Mroonga engine" unless $ENV{HA_MROONGA_SO} or
                                   $::mysqld_variables{'mroonga'} eq "ON";
 
-sub is_default { 1 }
+sub is_default { not $::opt_embedded_server }
 
 my $groonga_normalizer_mysql_dir=$::basedir . '/storage/mroonga/vendor/groonga/vendor/plugins/groonga-normalizer-mysql';
 my $groonga_normalizer_mysql_install_dir=$::basedir . '/lib/groonga/plugins';