Environment::nodeId Should Throw SystemException When Node ID is 0?

[andrewauclair]

We've had a few issues with this recently. If the Environment_UNIX.cpp EnvironmentImpl::nodeIdImpl fails to find a node ID it simply leaves the node ID as all 0's. A similar thing appears to happen on Windows. We then assume that this is a valid ID and use it. Some parts of our system end up getting 0's and other parts get a valid node ID and fail to communicate.

I think that this would work better if a SystemException was thrown when nodeIdImpl fails to set a value.