ACCUMULO-2551 adds read only fate operations.
ACCUMULO-2519 Aborts upgrade if there are Fate transactions from an old version.
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT

  Conflicts:
      fate/src/main/java/org/apache/accumulo/fate/AdminUtil.java
      fate/src/main/java/org/apache/accumulo/fate/TStore.java
      server/base/src/main/java/org/apache/accumulo/server/Accumulo.java
      server/src/main/java/org/apache/accumulo/server/master/Master.java
      server/src/main/java/org/apache/accumulo/server/util/MetadataTable.java
      server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java
ACCUMULO-2519 Updates Classes added in 1.6.0 for read only fate changes.
ACCUMULO-2148 change upgrade docs to cover 1.5 -> 1.6
ACCUMULO-2499 Added list of default ports and information about ephemeral ports.

Signed-off-by: Mike Drob <mdrob@cloudera.com>
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT