modules/http: Add option to suppress errors when max redirects exceeded

[codyprime]

If the --max-redirects value is exceeded, we return SCAN_APPLICATION_ERROR with "Too many redirect" as the error message.

Add an option (--redirects-succeed) to suppress this error, and return success even if we exceed the maximum specified number of redirects.

How to Test

echo google.com | zgrab2 http --max-redirects=0

This should show a failure status:

      "timestamp": "2020-02-26T16:54:20-05:00",
      "error": "Too many redirects"
    }
{"statuses":{"http":{"successes":0,"failures":1}},"start":"2020-02-26T16:55:53-05:00","end":"2020-02-26T16:55:53-05:00","duration":"78.194261ms"}

With the new flag, it should succeed:
echo google.com | zgrab2 http --max-redirects=0 --redirects-succeed

      },
      "timestamp": "2020-02-26T16:55:12-05:00"
    }
{"statuses":{"http":{"successes":1,"failures":0}},"start":"2020-02-26T16:55:28-05:00","end":"2020-02-26T16:55:28-05:00","duration":"69.901353ms"}