ACCUMULO-1794 adds hdfs failover to continuous integration test.

Signed-off-by: Josh Elser <elserj@apache.org>
ACCUMULO-1942 Make zookeeper provided in example pom
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	examples/simple/pom.xml
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT

Conflicts:
	test/system/continuous/start-agitator.sh
	test/system/continuous/stop-agitator.sh
Merge branch '1.5.1-SNAPSHOT' of https://git-wip-us.apache.org/repos/asf/accumulo into 1.5.1-SNAPSHOT
ACCUMULO-1794 Unnecessary pkill invocation. Existing call will catch all necessary.
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT

Conflicts:
	test/system/continuous/stop-agitator.sh
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT