1. support local whois. 2 add some useful bird command

[KusakabeShi]

1. support local whois.
   • spacifing it with /usr/bin/whois to use local whois binary instead of online whois server
2. 2 add some useful bird command
   1. show route protocol ...: show all routes comes from this protocol
   2. show route protocol ... all:
   3. show route protocol ... all primary:
   4. show route filtered protocol ...: show all filtered routes comes from this protocol
   5. show route filtered protocol ... all:
   6. show route where bgp_path.last = ...: show all filtered routes comes from this asn origin
   7. show route where bgp_path.last = ... all:
   8. show route where bgp_path.last = ... all primary:

[xddxdd]

Thanks for your contribution!