ScanClient connection close() and exception handling

[kasemir]

ScanClient has a few sections like this:

try:
   conn = urllib2.urlopen
   .. do_something ..
   conn.close()
except Exception as ex:
            raise ex

It's great to think about closing the connection, and also to handle exceptions. In this example, however, except simply raises the original exception, it doesn't add anything. If .. do_something .. fails, close() is not called.

Better:

conn = urllib2.urlopen
try:
   .. do_something ..
finally:
   conn.close()

[ksdj]

Ah! Yes it is! I will change this.