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Rerunning ohai wastes a lot of time. This should
get us back to within our time limits in appveyor
even with the perf regression in Ohai.

Don't rerun ohai for unit/regsitry_helper_spec

Ohai is slow. We don't need to rerun this, it's
already run in our spec_helper.

Don't keep rerunning ohai for reboot_pending_spec

Running Ohai is slow. This should know almost 2
mins off the runtime of the tests.

Don't need to run ohai for registry_spec

crypto_spec does not need its own ohai

cmdlet_spec does not need its own ohai

functional registry_helper_spec does not need its own ohai

Use spec ohai system for knife configure_spec

Use OHAI_SYSTEM for dsc_script_spec

use OHAI_SYSTEM for dsc_resource_spec

This is an entirely mechanically generated (chefstyle -a) change, to go
along with chef/chefstyle#5 . We should pick something and use it
consistently, and my opinion is that double quotes are the appropriate
thing.

ohai[:fqdn] depends on DNS and may be nil.  change the algorithm to use
the hostnaome of the machine as a fallback using the same algorithm
that Chef::Client uses for guessing the node_name of a host.