xtrabackup.sh only touch when backup_success_file_path is set #1522
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By default
backup_success_file_pathisundefwhat result in atouchcommand without argument that will produce an error liketouch: missing file operand.With this merge request we only add the
touchcommand to the script when the value ofbackup_success_file_pathis defined.Also added rspec test for both cases.