[hobbit] Remove test columns

[Peter Welter]

>  I tried running:
>
>     /~/server/bin/bb 127.0.0.1 "drop HOSTNAME test"
You did substitute the actual hostname for HOSTNAME? So, when host
garfield delivered data for test and has stopped delivering data, the
following should work:

~/server/bin/bb 127.0.0.1 "drop garfield test"

-- Peter