ACCUMULO-2266 Checking hdfs minimum block size and failing if it clashes with walog max size
Merge remote-tracking branch 'origin/1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java
ACCUMULO-2144 fixed listcompactions and listscans so they no longer wrap the appropriate exceptions in RTEs
Merge remote-tracking branch 'origin/1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java