RHSM HTTP proxy
RHSM HTTP proxy

This patch add possibility to configure HTTP proxy for subscription-manager.

Change-Id: I27ae4e9396630e81b10344982b90bee01723f56b
Fixes: rhbz#1123875

imcsk8/packstack,fr34k8/packstack,mahak/packstack,imcsk8/packstack,xbezdick/packstack,stackforge/packstack,mahak/packstack,openstack/packstack,openstack/packstack,xbezdick/packstack,imcsk8/packstack,mahak/packstack,fr34k8/packstack,stackforge/packstack,stackforge/packstack,openstack/packstack,fr34k8/packstack,palmer159/openstack-test,palmer159/openstack-test,xbezdick/packstack,palmer159/openstack-test