Without this change, I cannot get the in-tree VPP Vagrant to work behind
a proxy. This commit fixes that by ensuring when we run sudo we're passing
environment variables, amongst some other cleanups.
Change-Id: Ica98a1238d40e6e6ccf80c472f52559c95af52f0
Signed-off-by: Kyle Mestery <mestery@mestery.com>