(MODULES-8201) Add pending reboot due to domain join for windows.

[razorbladex401]

Add an option to the module that checks if there is a pending reboot due to a domain join. This will allow flexibility when puppet is not only joining a server to the domain but also installing software that will trigger a reboot due to software installation. This is especially useful when provisioning servers thru something like Cloudbolt and having a system reboot in the middle of a run will cause failures.

[Iristyle]

I'm not sure if we also need to look at AvoidSpnSet as well?

The DSC resource (forked by MS employee @bcwilhite) checks that value as well in https://github.com/bcwilhite/PendingReboot/blob/aecb6e44ea3ce5d44c2c740d2c08eda79e955419/Public/Test-PendingReboot.ps1#L162-L165

[Iristyle]

So this is a pretty interesting (and useful!) addition to the module. Thanks @razorbladex401 !

Oddly, there appears to be scant information on this particular registry key (https://serverfault.com/a/735854), though some prior art at https://gallery.technet.microsoft.com/scriptcenter/Get-PendingReboot-Query-bdb79542 provided by a Microsoft employee

The changelog there states

 07/27/2015:
-Added Domain Join detection to PendComputerRename, DOES NOT currently detect Workgroup Join/Change.

So I'm inclined to believe this is a legitimate thing to check for, but we may want to do a little vetting here manually (it will be difficult to vet this in an automated fashion given it requires a domain)