Currently if the user specifies -e and procfs is not mounted on /proc, printing of the process environment will fail silently.
Currently if the user specifies -e and procfs is not mounted on /proc,
printing of the process environment will fail silently.

-define a function which will check to see if procfs is mounted on /proc
-Implement this test if the user specified -e
-If procfs is not mounted on /proc and -e was specified, print a warning.
 informing the user that procfs(5) is required.

Reviewed by:	wes, rwatson

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