Exposing internal sysmon_envsys(8) structures to userland

[Paul Goyette <paul%whooppee.com@localhost>]

It has always bothered me that src/sys/sys/envsys.h exposes several 
internal data structures to userland.  It seems to me that the only 
items from this header file that should really be exported are

* the definitions for the various IOCTLs
* the definitions for the sensor units
* the definitions for the sensor states/values
* the definitions for the legacy "struct envsys_tre_data"

The "struct sysmon_envsys_lim" and "struct envsys_data" should be moved 
into src/sys/dev/sysmon/sysmon_envsysvar.h along with the related 
internal flags and properties definitions.

Comments?


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