[PC-BSD Dev] PC-BSD 9.1 network configuration proxy issue

[Fabrizio Parrella]

I just found another small issue on the proxy configuration part.

If you set a proxy and restart the network the proxy (and setenv parts) 
are added to the `env` correctly, but when you disable the proxy they 
are not removed and '/etc/profile ' still contains the "NO_PROXY" variables.

Something else that I have noticed is that even if I remove the env by 
hand via terminal and restart the various programs as well as the 
network making sure the envs are not back, all the programs "remember" 
the proxy.  Haven't tried to restart the computer, but I assume that 
once restarted the proxy was going to be forgotten.  I will test that 
part later if needed.

Thank you

Fabry