HBASE-12666 TestAssignmentManager hanging; add timeouts
    HBASE-12665 When aborting, dump metrics
    Add some fixup of checkstyle fails

Conflicts:
	hbase-common/src/main/java/org/apache/hadoop/hbase/CellUtil.java
	hbase-server/src/main/java/org/apache/hadoop/hbase/http/jmx/JMXJsonServlet.java