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H A DREADME88733e2c65b1b118e6e1a942d62a48ce62a5ea40 Tue Oct 22 19:07:34 CDT 2013 Andrew Ruder <andrew.ruder@elecsyscorp.com> cmd_nvedit.c: Add env exists command

env exists is a way to test (in hush) if an environment variable
exists. A workaround existed using printenv but this new command
doesn't require all the stdout/stderr redirection to prevent
printing information to the screen.

Example:
$ set testexists 1
$ env exists testexists && echo "yes"
yes
$ env exists testexists || echo "no"
$ set testexists
$ env exists testexists && echo "yes"
$ env exists testexists || echo "no"
no
$

Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>