AddInterface method
Enable external networking.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #6 from erikh/addiface

Enable external networking.
Get vxlan peering with remote network access working as expected.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #7 from erikh/addiface

Get vxlan peering with remote network access working as expected.
Merge pull request #123 from LK4D4/AddIface

Networking inside containers