ACCUMULO-2065 Using the hostname for the system running the monitor instead of what was passed via --address.

The only downside here is if DNS is not set up. However, if DNS is not set up, you're likely running on a single box, at
which point localhost is all you need anyways.
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	server/monitor/src/main/java/org/apache/accumulo/monitor/Monitor.java
ACCUMULO-2068 Remove deprecation warning as we're preserving backwards compatibility for functionality that has existed
for a very long time.
ACCUMULO-2057 handle multiple last locations gracefully
ACCUMULO-2057 handle duplicate last locations gracefully
ACCUMULO-2057 handle duplicate last locations gracefully