Ensure that we are catching/logging all exceptions

[ben-jones]

Before we deploy to our initial set of clients, we need to make sure that we are logging all of the exceptions. This will allow us to understand what went wrong when/if our program crashes

[gsathya]

(centinel)➜  centinel git:(master) ack "Exception" -A 2 centinel/
centinel/backend.py
94:        except Exception as e:
95-            logging.error("Unable to register: %s" % str(e))
96-            raise e
--
104:    except Exception, e:
105-        logging.error("Unable to create user: %s" % str(e))
106-        return
--
114:        except Exception, e:
115-            logging.error("Unable to send result file: %s" % str(e))
116-
--
129:    except Exception, e:
130-        logging.error("Unable to download experiment files %s", str(e))
131-

centinel/client.py
78:            except Exception, e:
79-                logging.error("Error in %s: %s" % (name, str(e)))
80-

centinel/experiments/tcp_connect.py
30:        except Exception as err:
31-            result["failure"] = str(err)
32-

centinel/experiments/turkey.py
44:        except Exception as err:
45-            result["blocked"] = str(err)
46-

centinel/primitives/http.py
34:    except Exception as err:
35-        response["failure"] = str(err)
36-

looks like we are? @ben-jones should i close this?

[ben-jones]

@gsathya, sounds great.