Problem was that in SST log_bin_index name and directory was not
handled and passed to rsync SST script.
wsrep_sst_common.sh
Read binlog index dirname and filename if --binlog-index
parameter is provided. Read binlog filenames from that file
from donor and write transfered binlog filenames to that
file in joiner.
mysqld.cc, mysqld.h
Moved opt_binlog_index_name from static to global and added
it to extern.
wsrep_sst.cc
generate_binlog_index_opt_val
New function to generate binlog index name if opt_binlog_index_name is
given on configuration.
sst_prepare_other
Add binlog index configuration to SST command.
wsrep_sst.h
Add new SST parameter --binlog-index
Add test case.
