(#8662) Break circular feature dependency

The root feature was being evaluated prior to the microsoft_windows
feature being defined. On Windows, this had the side-effect of calling
Process.uid prior to the win32 sys/admin gem being loaded. And the
default ruby implementation of Process.uid always returns 0, which
caused Puppet.features.root? to always return true.

This commit reorders the syslog, posix, microsoft_windows, and root
features due to dependencies among them. This ensures the
microsoft_windows feature is defined prior to evaluating the root
feature.

As a result of this commit, the SUIDManager now calls the win32
sys/admin version of the Process.uid method, which returns the RID
component of the user's SID. As this is not 0, Puppet.features.root?
will now always return false on Windows. A future commit will fix
this, so that Puppet.feature.root? only returns true when running as
the Windows-equivalent of root.