Import libdoozer-0.1 as wip/libdoozer.

libdoozer is a C++ client library for the Doozer lock service. It implements
all the client functions the Go library has. It can be used for:

 - Synchronized configuration update,
 - Optimistic resource locking,
 - Master election and
 - Service autodiscovery.

It supports multiple master processes in multiple locations while still
guaranteeing a globally consistent state.