[CHEF-5328] Fixed Chef::User.list API error with inflate=true
[CHEF-5328] Added tests for Chef::User.list with inflate=true
[CHEF-5328] User#load(inflate=true) use Hash#inject instead of Hash[]
Merge pull request #1456 from onddo/CHEF-5328

[CHEF-5328] Chef::User.list API error with inflate=true