Make it the default for ECS AMI to go via the weave proxy

[2opremio]

Various options:

• Make eval $(weave env) only upon the initialization of interactive shells.
• Make /var/run/docker.sock point to the proxy (really invasive)

[errordeveloper]

Make /var/run/docker.sock point to the proxy (really invasive)

I am not sure I could possibly see a good reason to do such an invasive thing

[errordeveloper]

This could be done via the CFN path as well. May be /etc/profile.d/weaveproxy would be okay, certainly not anything in the home directory.