libnetwork agent mode is a mode where libnetwork can act as a local
agent for network and discovery plumbing alone while the state
management is done elsewhere. This completes the support for making
libnetwork and its associated drivers to be completely independent of a
k/v store(if needed) and work purely based on the state information
passed along by some some external controller or manager. This does not
mean that libnetwork support for decentralized state management via a
k/v store is removed.
Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
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