Post-exploitation module to dump the dns cache entries.

The module dump the dns cache (domain and type) by using the DnsGetCacheDataTable API (dnsapi.dll). 
One interesting thing I noticed  in Windows 7 is that even if the TTL of the entry has expired you can still see the domain by using this API (which would not be shown by running: ipconfig /displaydns).
To completely erase the cache you need to run ipconfig / flushdns

Example:

msf post(dnscache_dump) > run

   TYPE  DOMAIN
   ----  ------
   0001  localhost
   0001  www.rapid7.com
   0001  www.metasploit.com
   0001  client.openvpn.net
   0005  www.shelliscoming.com
   000c  2.0.94.127.in-addr.arpa
   000c  1.0.94.127.in-addr.arpa
   000c  1.0.0.127.in-addr.arpa