Use promiscuous mode in targets-sniffer.nse.

CHANGELOG

@@ -1,5 +1,8 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o [NSE] Turned on promiscuous mode in targets-sniffer.nse so that it
+  finds packets not only from or to the scanning host. [David]
+
 o [NSE] Added scripts that grab information from the HTTP servers on
   various ports used by Apache Hadoop and HBase.
   - hadoop-datanode-info.nse

scripts/targets-sniffer.nse

@@ -86,7 +86,7 @@ action = function()
     stdnse.print_debug(1,"Error - unable to open socket using interface %s",interface)
     return
   else
-    sock:pcap_open(interface, 104, false , "ip")
+    sock:pcap_open(interface, 104, true, "ip")
     stdnse.print_debug(1, "Will sniff for %s seconds on interface %s.", (timeout/1000),interface)
 
     repeat