Revert "Don't use echo driver in st2.dev.conf since it causes too much noise"
Revert "Don't use echo driver in st2.dev.conf since it causes too much noise"

This reverts commit 593048da29a87b3a32c5968271c691b3d35903ed.

Plexxi/st2,nzlosh/st2,nzlosh/st2,StackStorm/st2,StackStorm/st2,nzlosh/st2,Plexxi/st2,nzlosh/st2,Plexxi/st2,Plexxi/st2,StackStorm/st2,StackStorm/st2