cleanup: galera merge, simple changes
bugfix: remove the code that broke XA recovery
disable wsrep by default.
fix wsrep not to crash when started disabled
fix cmake detection of bfd.h
cleanup: remove galera/wsrep magic from mtr
correct handling on defaults[-extra]-file is SST scripts

pass --defaults-file and --defaults-extra-file
(whatever was specified, or none)
from mysqld down to SST scripts.

parse these options in SST scripts and pass them down
to mysqldump, my_print_defaults, and xtrabackup
extend SHA1 service. cleanup of sha1 wrappers
MD5 service
use MD5 service in innodb/xtradb
fixing embedded: first set of changes (storage engines don't work yet)
fixing embedded: WaaS. Wsrep as a Service.
small cleanup
cleanup: wsrep_check_opts
restore and fix wsrep status variables
cleanup: remove OPT_WSREP_START_POSITION and OPT_WSREP_SST_AUTH

there is no reason to initialize wsrep start position
and auth from inside the get_one_option() callback
cleanup: introduce CF_SKIP_WSREP_CHECK

remove if() over many COM_xxx values
mtr - temporary changes