Fix specs to set attributes using node.set in preparation for Chef 11.0
Fix specs to set attributes using node.set in preparation for Chef 11.0

Fixes the following warning with Chef 10.6.2:

	WARN: Setting attributes without specifying a precedence is deprecated and will be
	removed in Chef 11.0. To set attributes at normal precedence, change code like:
	`node["key"] = "value"` # Not this
	to:
	`node.set["key"] = "value"` # This

sethvargo/chefspec,mcoolive/chefspec,375gnu/chefspec,jkeiser/chefspec,jimhopp/chefspec,zuazo-forks/chefspec,aspiers/chefspec,sethvargo/chefspec,ranjib/chefspec,chefspec/chefspec,jkeiser/chefspec,lamont-granquist/chefspec,bheuvel/chefspec,gsavage/chefspec,Thalagyrt/chefspec,shanethehat/chefspec,bheuvel/chefspec,h4ck3rm1k3/chefspec,gsavage/chefspec,rsr5/chefspec,mcoolive/chefspec,oldirty/chefspec,lamont-granquist/chefspec,shanethehat/chefspec,h4ck3rm1k3/chefspec,jtimberman/chefspec,375gnu/chefspec,aspiers/chefspec,ranjib/chefspec,chefspec/chefspec,jtimberman/chefspec,oldirty/chefspec,rsr5/chefspec,coderanger/chefspec,coderanger/chefspec,Thalagyrt/chefspec