allow direct access to iis configuration parameters

[chris-rock]

The current IIS resource has not exposed the data without a matcher:

# test the site with the resource
describe iis_site('Default Web Site') do
  it { should exist }
  it { should be_running }
  it { should have_app_pool('DefaultAppPool') }
  it { should have_binding('http *:80:') }
  it { should have_path('%SystemDrive%\\inetpub\\wwwroot') }
end

This PR allows users to access the data directly

# test the site with the resource
describe iis_site('Default Web Site') do
  it { should exist }
  it { should be_running }
  its('app_pool') { should eq 'DefaultAppPool' }
  its('bindings') { should include 'http *:80:' }
  its('path') { should eq '%SystemDrive%\\inetpub\\wwwroot' }
end

[chris-rock]

cc @chrisevett

[stevendanna]

👍 This looks like a reasonable improvement. Give how much this class delegates to the SiteProvider, it makes me wonder if they should be one class, but I don't know where else this is used.