Rearranging order of configs in kafkatee.conf.example

I've moved the global configs closer to the top of the file.
Outputs and inputs are now all at the bottom, as is the
include documentation.  By putting the include at the bottom
of the file, I believe any subsequently included configs
will override any previously set ones.  Correct me if I am
wrong.

Change-Id: Ie4cd0f571bb31cdf89323cb84da2fc8e48de3081