AllowedOperations tests

[Dain Sundstrom <da...@iq80.com>]

I'm working on the MDB itests and need to add some more operations  
for the AllowedOperations tests.  My question is should I add them to  
the end of the enumeration, or can I place them along side the other  
similar operations?  Specifically, I need to add Context_lookup,  
which I would like to place next to the other "Context_" entries.

Also, I think we should convert the Operation object to an  
Enumeration and EnumSet over the wire.  This will make is much easier  
to read the output.

The allowed operation tests really need to be updated to reflect the  
new tables in the spec and the operation checks added.  I'd love to  
do that now, but simply don't have the time.

-dain