[FIX] packaging: avoid traceback on virtual machine timeout

When the virtual machine used to build MS Win package takes too much
time (to build or to test the build), a warning is logged and the VM is killed.

Before this commit, the PID of the process was passed as an argument to
the warning method, causing a traceback.

setup/package.py

@@ -181,7 +181,7 @@ def __init__(self, o, image, ssh_key='', login='openerp'):
         self.login = login
 
     def timeout(self,signum,frame):
-        logging.warning("vm timeout kill",self.pid)
+        logging.warning("vm timeout kill (pid: {})".format(self.pid))
         os.kill(self.pid,15)
 
     def start(self):