ACCUMULO-2574 Implement some extraction methods on for replication keys
ACCUMULO-2709 Define WorkSection for data that needs to replicated to a specific system.
ACCUMULO-2709 Daemon to make units of work for replication

A daemon to run inside of the master with a basic test. Added some
some support to MockAccumulo to better support testing without needing
a minicluster. Added log4j configuration to master module too.
ACCUMULO-2579 Remove some tests which are now useless after moving away from creating a replication table at startup
ACCUMULO-2709 Another test to ensure that we generate a record for each configured replication target.
ACCUMULO-2709 Rework replication table schema and make a ReplicationTarget class

Since all of the replication data is now in its own table, we don't need to do
special ranges, but can just do "normal" column family filtering (with the added
benefit of locality groups, too). Made a ReplicationTarget class that's Writable
for some easy serialization (don't need protobuf). Fixed a bunch of unit tests accordingly