Merge pull request #41 from vishh/refactoring

Refactoring libcontainer to avoid cyclic dependencies in the future.
Rename Container -> Config.

Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
Merge pull request #39 from vmarmol/rename-container

Rename Container -> Config.
Add veth mac address param to network config.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)