Bulk Loader API could not tolerate even node failure

When user uses CqlBulkOutputFormat, it tries to stream to all the nodes in the token range, which includes the dead nodes. Therefore, the stream failed. There was a design in C* API to allow stream() method to have a list of ignore hosts, but it was not utilized.

The empty-argument stream() method is called in all existing versions of C*, i.e.
in v2.0.11, https://github.com/apache/cassandra/blob/cassandra-2.0.11/src/java/org/apache/cassandra/hadoop/AbstractBulkRecordWriter.java#L122
in v2.1.5, https://github.com/apache/cassandra/blob/cassandra-2.1.5/src/java/org/apache/cassandra/hadoop/AbstractBulkRecordWriter.java#L122
and current trunk branch https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/hadoop/cql3/CqlBulkRecordWriter.java#L241