Speed up some PBXT tests by adding begin...commit around creating of testing tables.

include/my_base.h:
  Fixed wrong constant
mysql-test/mysql-test-run.pl:
  Print MariaDB instead of MySQL
mysql-test/r/range.result:
  Move test that required partitions to parts.optimizer
mysql-test/suite/innodb_plugin/t/disabled.def:
  Disable test that causes valgrind warning about not released memory in xtradb
mysql-test/suite/parts/r/optimizer.result:
  Moved from range.result
mysql-test/suite/parts/t/optimizer.test:
  Moved from range.test
mysql-test/suite/pbxt/r/join_nested.result:
  Updated results after optimizer changes
mysql-test/suite/pbxt/r/renamedb.result:
  Updated test for new error message
mysql-test/suite/pbxt/t/check.test:
  Speed up test
mysql-test/suite/pbxt/t/count_distinct2.test:
  Speed up test
mysql-test/suite/pbxt/t/derived.test:
  Speed up test
mysql-test/suite/pbxt/t/renamedb.test:
  Updated test for new error message
mysql-test/suite/rpl/r/rpl_log_pos.result:
  Updated results
mysql-test/suite/rpl/t/rpl_log_pos.test:
  Update test to read from a position that has 'known wrong' data.
  The orignal test read a timestamp, so the error message could differ between runs.
mysql-test/suite/rpl/t/rpl_temporary_errors.test:
  Sync to slave to make test predictable
mysql-test/t/events_time_zone.test:
  Extend wait to make test predictable
mysql-test/t/range.test:
  Move test that required partitions to parts.optimizer
sql/sql_list.h:
  Fixed compiler warning
sql/sql_load.cc:
  buffer was not freed in some error conditions
tests/mysql_client_test.c:
  Fixed compiler warning