Don't override LWRP resources or providers anymore in Chef 12.

Closes https://github.com/opscode/chef/issues/1910.

Now that we're preventing the unforked interval runs in Chef Client, we don't need to reload the LWRP classes anymore. 

/cc: @opscode/client-engineers 


Seem like this should at least be a `warn` if it's not an exception, since the user asked us to do a thing and we're ignoring it.