tools/rados/rados.cc: restore ostream precision format

CID 717135 (yehudasa#1 of 1): Not restoring ostream format (STREAM_FORMAT_STATE)
1. format_changed: precision changes the format state of std::cout for
   category precision.
4. end_of_path: Changing format state of stream std::cout for category
   precision without later restoring it.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

src/tools/rados/rados.cc

@@ -564,8 +564,10 @@ class LoadGen {
     Mutex::Locker l(lock);
 
     double rate = (double)cur_completed_rate() / (1024 * 1024);
+    std::streamsize original_precision = cout.precision();
     cout.precision(3);
     cout << "op " << op->id << " completed, throughput=" << rate  << "MB/sec" << std::endl;
+    cout.precision(original_precision);
 
     map<int, LoadGenOp *>::iterator iter = pending_ops.find(op->id);
     if (iter != pending_ops.end())