refs #6090 auto install tokudb plugins

git-svn-id: file:///svn/mysql.com/mariadb-5.5.30@54850 c7de825b-a66e-492c-adef-691d508d4ae1
refs #6090 default storage engine is tokudb

git-svn-id: file:///svn/mysql.com/mariadb-5.5.30@54900 c7de825b-a66e-492c-adef-691d508d4ae1
refs #6090 default no engine substitution

git-svn-id: file:///svn/mysql.com/mariadb-5.5.30@54901 c7de825b-a66e-492c-adef-691d508d4ae1