edited test script

test/cpp/qps/run_perf_db_test.py

@@ -1,3 +1,4 @@
+#!/usr/bin/python
 #
 # Copyright 2015, Google Inc.
 # All rights reserved.
@@ -28,7 +29,6 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
-#!/usr/bin/python
 
 import os
 import sys