Add an example config that explains how to use ktest with a virtual
guest as the target.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>

I've been asked several times to provide more useful example configs for
ktest.pl, as the sample.conf is too complex (because it explains all
configs). This adds configs broken up by use case, and these configs are
based on actual configs that I use on a daily basis.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>