We gained a ton of improvemnts to WinRM error handling in
https://github.com/mitchellh/vagrant/pull/4943, but we also got one bug.
The new code raises an exception when `winrm_info` does not return right
away. This was preventing us from catching the retry/timout logic that's
meant to wait until boot_timeout for the WinRM communicator to be ready.
This restores the proper behavior by rescuing the WinRMNotReady
exception and continuing to retry until the surrounding timeout fires.
Command failures include the stdout and stderr in the error message just like the SSH communicator.
Its now possible to specify only an error_class and have that use the correct error_key by default.
Elevated command line is now rendered to a script which is uploaded to the guest and executed. This allows the command line itself to be less than 100 chars to start the script and any user commands are puts into the script which has unlimited* length.
- Fixed typo in helper test
- Removed extraneous machine.config prefix from Windows guest config validation
- Added WinRM communicator unit tests
- Added Windows guest capability unit tests
