Configuration for collect HBase metrics and log files

Chukwa can collect HBase metrics and logs with some preconfigured adaptors to stream HBase information.

1. Provide example of log4j configuration for HBase to stream logs to Chukwa.
2. Provide HBase metrics configuration to stream metrics to Chukwa.
3. Provide the Chukwa adaptor list which maps the HBase log streams.
4. Demux configuration to reuse Hadoop metrics parser to process HBase data.