[lisp-snmp] Experimental SIMPLE-OID cache support

[Chun T. <bin...@me...>]

(GMail is down, let me change to MobileMe)

Hi, John

I've commited a early version of the experimental SIMPLE-OID cache  
support for ASN.1 package, see r769.

If you think this feature is useful for you, please help me port it to  
Allegro CL.

Thanks,

Chun Tian (binghe)