Imports of readme_test command

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/docker/libnetworkPackage libnetwork provides the basic functionality and extension points to create network namespaces and allocate interfaces for containers to use.
github.com/docker/libnetwork/config
github.com/docker/libnetwork/netlabel
github.com/docker/libnetwork/optionsPackage options provides a way to pass unstructured sets of options to a component expecting a strongly-typed configuration structure.
github.com/docker/libnetwork/typesPackage types contains types that are common across libnetwork project