workloads: add sysbench

Port sysbench workload from WA2.

sysbench is a modular, cross-platform and multi-threaded benchmark tool
for evaluating OS parameters that are important for a system running a
database under intensive load.

wa/workloads/sysbench/LICENSE

@@ -0,0 +1,24 @@
+Included sysbench binary is Free Software ditributed under GPLv2:
+
+/* Copyright (C) 2004 MySQL AB
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+The full text of the license may be viewed here:
+
+http://www.gnu.org/licenses/gpl-2.0.html
+
+Source code for sysbench may be obtained here:
+
+https://github.com/akopytov/sysbench
+