Fix #168 Default owner of 'root' fails on Windows

[sgtcoolguy]

Description

Changes default of owner on resource from 'root' to nil. Then uses lazy init to set default owner if the value is still nil. On non-windows, sets 'root'. On Windows, uses WMI query to grab local admin account (typically 'Administrator'). The code for grabbing the windows admin user was copied from https://github.com/chef-cookbooks/chef-client/blob/master/libraries/helpers.rb#L37

Ultimately the WMI query code in that helper looks very similar to the one in the windows cookbook here: https://github.com/chef-cookbooks/windows/blob/master/libraries/wmi_helper.rb#L22

Perhaps both this and the chef-client cookbook can just re-use it?

Issues Resolved

• Default owner of 'root' fails on Windows #168

Check List

• All tests pass. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/TESTING.MD
• New functionality includes testing.
• New functionality has been documented in the README if applicable
• All commits have been signed for the Developer Certificate of Origin. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/CONTRIBUTING.MD

[tas50]

@sgtcoolguy You have a few failing chefspecs in Travis