Made stopping of slave more robust
Fixed tokudb test cases that gave different results between runs
Speed up some slow tokudb tests by adding begin ... commit


mysql-test/extra/rpl_tests/rpl_stop_slave.test:
  Ensure that slaves are properly synced before they are stopped.
  (Otherwise some tests results will be different between runs)
storage/innobase/buf/buf0buf.cc:
  Fixed compiler warning
storage/tokudb/mysql-test/tokudb/r/cluster_filter_unpack_varchar_and_int_hidden.result:
  Test case could be solved with index or range scan.
storage/tokudb/mysql-test/tokudb/t/cluster_filter_unpack_varchar_and_int_hidden.test:
  Test case could be solved with index or range scan.
storage/tokudb/mysql-test/tokudb_bugs/r/5733_innodb.result:
  Speed up test by adding begin...commit
storage/tokudb/mysql-test/tokudb_bugs/r/5733_tokudb.result:
  Speed up test by adding begin...commit
storage/tokudb/mysql-test/tokudb_bugs/t/5733_innodb.test:
  Speed up test by adding begin...commit
storage/tokudb/mysql-test/tokudb_bugs/t/5733_tokudb.test:
  Speed up test by adding begin...commit
storage/tokudb/mysql-test/tokudb_mariadb/r/compression.result:
  Added drop table (safety)
storage/tokudb/mysql-test/tokudb_mariadb/t/compression.test:
  Added drop table (safety)