Fix error in library when running under Python 3

Add parenthesis to print statement parameters.

Signed-off-by: Steven Sombar <ssombar@us.ibm.com>
Change-Id: I4fe74b9cf5055374a64ea550333289e44759ac61
diff --git a/lib/utils_files.py b/lib/utils_files.py
old mode 100644
new mode 100755
index ca4d72e..f59849e
--- a/lib/utils_files.py
+++ b/lib/utils_files.py
@@ -119,7 +119,7 @@
     if robot_env == 1:
         BuiltIn().log_to_console("DIFF:\n" + out_buf)
     else:
-        print "DIFF:\n", out_buf
+        print ("DIFF:\n", out_buf)
 
     file.write(out_buf)
     file.close()