Filter all resources that lack a `source_line` attribute
Filter all resources that lack a `source_line` attribute

Due to a bug in Chef, when resources are cloned (specifically the `service`
resource), both the clone *and the original resource* lose all metadata
information including their source line. Chef claims this is not a bug.

As a result, ChefSpec cannot reliably check if a resource has been covered
when it was cloned. This commit excludes all resources that lack the proper
metadata to determine if they have been covered.

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