moxi can optimize ascii-to-binary single key gets

moxi currently treats each ascii GET command as if it was a multiget. That is, moxi translates an ascii GET commands into binary getkq's for each key and also sends a binary noop's for every server.

get a b c

translates into...

getkq a
getkq b
getkq c
noop x number of servers

When there's a single key in the ascii GET, this is inefficient. Instead, a simple binary GETK could be used when there's a single key.