Fix for Issue #409

[Hal Murray]

I just pushed a fix for Issue #409.  The drift file now gets created with the 
normal protection modes rather than 600 so apparmor should be happy when 
reading it as root during startup.  (Unless you have a non-standard default 
mode.  ...)

I also added a few more uses of uptime_t and removed several volatile-s that 
are no longer necessary.


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