ACCUMULO-1637 Rework the hadoop append/sync checks trying to match what
Hadoop is doing internally by default.
ACCUMULO-1637 Lifting the ticket message into its own string constant
Merge branch '1.5.1-SNAPSHOT'

Conflicts:
	server/src/main/java/org/apache/accumulo/server/tabletserver/TabletServer.java
ACCUMULO-1782 Point bulk load tests away from HDFS root

This is a follow-on patch to ACCUMULO-1563, which adjusted directories
in some tests to avoid writing into the root of HDFS.

Signed-off-by: Eric Newton <eric.newton@gmail.com>
Merge branch '1.5.1-SNAPSHOT'

Conflicts:
	test/system/auto/simple/bulk.py
	test/system/auto/simple/compaction.py