only set http_proxy and https_proxy when needing to access internet

[Aaron Rosen]

In my setup I have to use an http_proxy to access the internet and setting http_proxy=proxy_server in my localrc does not work. The reason for this is when devstack performs commands against an IP address they are forwarded to the http_proxy which doesn't forward them back to me.

For example:

export http_proxy=http://10.113.161.210:3128
$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr fa:16:3e:5e:7b:09
          inet addr:192.168.1.4 Bcast:192.168.1.255 Mask:255.255.255.0

wget 192.168.1.4

tcpdump -i eth0 tcp port 80 and 3128

13:47:00.061976 IP 192.168.1.4.41434 > 10.113.161.210.3128: Flags [S], seq 4167652687, win 14600, options [mss 1460,sackOK,TS val 23854447 ecr 0,nop,wscale 4], length 0