Add basic netty replication utility
This adds a source/sink datastore replication component based on
Netty TCP channels. The sink (consumer) connects to source (producer)
via a channel, specifies which data tree it wants replicated and
then listens for DataTreeCandidates to arrive from the source.
Change-Id: Ib283baa9a186ae2fb4ccf909b257006d4645de37
Signed-off-by: Tibor Král <tibor.kral@pantheon.tech>
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit
d7b666857c54c07d9bf5c8e5e38671151d89fb4c)