It appears that the cacert option for the winrm provisioner was
not getting passed correctly to the winrm package. Log output
showed that CACert was false regardless of configuration.
While the validation of the connector looked for cacert, the winrm
communicator looked for ca_cert.
* We now return an error when you set the script_path to
C:\Windows\Temp explaining this is currently not supported
* The fix in PR #1588 is converted to the updated setup in this PR
including the unit tests
Last thing to do is add a few tests for the WinRM communicator…
Eamon Hetherton