Added filter for operations not supported on windows platform.

Kernel-panic delayed reset is not avaiable on windows platform.
Access to some hardware-related info from chef and ohai is also not available (e.g. dmi)
Added support for selecting the operating system in the web interface

Added the support for selecting Windows as target operating system in the
admin web interface. If required (e.g. Windows Server 2012), a license key
can be provided as well. For Microsoft Hyper-V no lincese key is required.