Added hton_name() and handler->engine_name() and use these when appropriate


KNOWN_BUGS.txt:
  Added some of the known bugs
mysql-test/r/maria.result:
  Added test for TRANSACTIONAL=1
mysql-test/r/myisam.result:
  Added test for TRANSACTIONAL=1
mysql-test/t/maria.test:
  Added test for TRANSACTIONAL=1
mysql-test/t/myisam.test:
  Added test for TRANSACTIONAL=1
sql/handler.cc:
  ha_resolve_storage_engine_name() -> hton_name()
sql/handler.h:
  Added hton_name() and handler->engine_name()
sql/set_var.cc:
  Use hton_name()
sql/sql_table.cc:
  Add warning of TRANSACTIONAL=1 is used with handler that doesn't support it
  Indentation fixes
  ha_resolve_storage_engine_name() -> hton_name()
sql/sql_tablespace.cc:
  ha_resolve_storage_engine_name() -> hton_name()
  Indentation fixes
sql/sql_yacc.yy:
  ha_resolve_storage_engine_name() -> hton_name()
sql/unireg.cc:
  ha_resolve_storage_engine_name() -> hton_name()
  Indentation fixes