adds KMEANS execution error check on server side

If the KMEANS benchmark execution fails, an error message will appear in stdout of the
executed program. The server checks for an error message before sending the execution
results back to the client.

src/main/java/lancs/dividend/oclBenchMapper/RodiniaRunner.java

@@ -98,6 +98,9 @@ private ResponseMessage executeKmeans(String execPrefix, DataSetSize dsetSize) {
 		String stdout = ShellCmdExecutor.executeCmd(cmdBld.toString(), true);
 		System.out.println(stdout);
 
+		if(stdout.contains("ERROR"))
+			return new ErrorResponseMessage("Benchmark execution failed.\n" + stdout);
+
 		return new BenchStatsResponseMessage(stdout);
 	}