Turn off aws and azure testing via NO_AWS env.

This massively speeds up our testing, shaving our functionals by a
third (639s -> 423s). We can realize this speedup either by setting
the env or by jettisoning aws and azure into their own separately
tested gems.

This is currently turned off for travis just for demonstration
purposes.

Signed-off-by: Ryan Davis <zenspider@chef.io>

.travis.yml

@@ -24,6 +24,7 @@ before_install:
 env:
   - SLOW=1
   - CI_ENABLE_COVERAGE=true SLOW=1
+  - NO_AWS=1
 script: bundle exec rake $SUITE
 matrix:
   fast_finish: true

lib/inspec/resources.rb

@@ -2,7 +2,7 @@
 
 # Detect if we are running the stripped-down inspec-core
 # This relies on AWS being stripped from the inspec-core gem
-inspec_core_only = !File.exist?(File.join(File.dirname(__FILE__), '..', 'resource_support', 'aws.rb'))
+inspec_core_only = ENV['NO_AWS'] || !File.exist?(File.join(File.dirname(__FILE__), '..', 'resource_support', 'aws.rb'))
 
 require 'rspec/matchers'