Icehouse branch version updates

Change-Id: I2a70ac3e864abbfe2dc0a5abfad65af35b33892b
Update ChefSpec to 3.4.0

This change gives us new capabilities, such as matching notifies and
subscribes of resources.

Implements: blueprint chefspec-3-4
Change-Id: If9c4e70f4b3e99cf75bb595ca577be01a072eced