work with latest docker

Signed-off-by: Alex Suraci <asuraci@pivotal.io>
container exposes external IP in .Info

Signed-off-by: Alex Suraci <asuraci@pivotal.io>
stop installing strace; it's now in the image

Signed-off-by: Alex Suraci <asuraci@pivotal.io>
force rebuilding of packages with -tags daemon

Signed-off-by: Alex Suraci <asuraci@pivotal.io>
Add unit test for -externalIP flag

[#83091172]
Tell README.md about need to add -tags daemon flag

needed to build docker dependencies

[#83091172]
Merge branch 'external-ip'

[#83091172]