Added 1000ms as the default read timeout used when calling pcap_open_live. Added BaseSniffer::set_timeout to modify this parameter.

include/sniffer.h

@@ -192,6 +192,14 @@ namespace Tins {
          */
         int get_fd();
 
+        /**
+         * \brief Sets the read timeout for this sniffer.
+         *
+         * This calls pcap_set_timeout using the provided parameter.
+         * \param ms The amount of milliseconds.
+         */
+        void set_timeout(int ms);
+
         /**
          * \brief Retrieves this sniffer's link type.
          *