Preventing environment variable expansion in windows displays unexpected output

[gshively11]

I tried to track down the root cause of this but was unable to in the time I had available.

In cmd.exe, running this echo %^COMPUTERNAME% outputs %COMPUTERNAME%

In mixlib/shellout, running

blah = Mixlib::ShellOut.new("echo %^COMPUTERNAME%")
blah.run_command.stdout

outputs %^COMPUTERNAME%. I would expect the carat to be removed like it is in cmd.exe.

The end result of this behavior is that I can't run commands that expected unexpanded environment variables as arguments.

[lamont-granquist]

that commit (i'll probably rebase it soon which will make the sha change but the most recent version should keep on getting posted to this issue) adds a test for the current behavior as to how we call CreateProcessW.