add mtr support files for tokudb_sys_vars tests

storage/tokudb/mysql-test/tokudb_sys_vars/include/have_tokudb.inc

+let $datadir=`select @@datadir`;

storage/tokudb/mysql-test/tokudb_sys_vars/suite.opt

+--tokudb --plugin-load-add=$HA_TOKUDB_SO --loose-tokudb-check-jemalloc=0 --sql-mode=NO_ENGINE_SUBSTITUTION

storage/tokudb/mysql-test/tokudb_sys_vars/suite.pm

+package My::Suite::TokuDB;
+use File::Basename;
+@ISA = qw(My::Suite);
+
+# Ensure we can run the TokuDB tests even if hugepages are enabled
+$ENV{TOKU_HUGE_PAGES_OK}=1;
+
+#return "Not run for embedded server" if $::opt_embedded_server;
+return "No TokuDB engine" unless $ENV{HA_TOKUDB_SO} or $::mysqld_variables{tokudb};
+
+sub is_default { not $::opt_embedded_server }
+
+bless { };
+