remove 'drop database' from new tests.


mysql-test/suite/rpl/r/rpl_innodb_bug28430.result:
  remove "DROP DATABASE test"
mysql-test/suite/rpl/r/rpl_innodb_bug30888.result:
  remove "DROP DATABASE test"
mysql-test/suite/rpl/r/rpl_innodb_bug30919.result:
  remove "DROP DATABASE test"
mysql-test/suite/rpl/t/rpl_innodb_bug28430.test:
  remove "DROP DATABASE test"
mysql-test/suite/rpl/t/rpl_innodb_bug30888.test:
  remove "DROP DATABASE test"
mysql-test/suite/rpl/t/rpl_innodb_bug30919.test:
  remove "DROP DATABASE test"
storage/innobase/handler/ha_innodb.cc:
  undo unneccessary edits.