[bind10-dev] don't use numeric type number in log output

[Jeremy C. Reed]

2011-08-15 14:37:23.002 DEBUG [b10-resolver.cache] 
CACHE_LOCALZONE_UPDATE updating local zone element at key 
l.root-servers.net.28

I initially wondered what does that .28 mean?  After looking at source 
documentation for genCacheEntryName I see this is the type number. So I 
search and find RFC 1886 so I can know "28".  (If you want to know the 
answer, read it :)

Why use numeric representation in the output used by admin?