Add some commonly-needed MIB definitions to the default compiled
set. The RFC-1212 provided in this commit is a shim (jsmiparser
defines the OBJECT-TYPE macro internally) and the RFC1213-MIB in
this commit is modified not to attempt to import OBJECT-TYPE.
This should save time and pain for first-time users of the MIB
compiler.

This commit fixes NMS-6183.
Merge branch '1.12' of github.com:OpenNMS/opennms into 1.12