test: exercise EE function type checking paths

This commit adds tests for on(), once(), removeListener(),
and prependOnceListener(), which all throw a TypeError if
the listener argument is not a function.

PR-URL: https://github.com/nodejs/node/pull/8168


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>