XD-1446 Update spring-data-hadoop dependency and add new Hadoop distros

- Changing Spring for Apache Hadoop dependency to 2.0.0.RC3

- Adding Pivotal HD 2.0 as distro (phd20)

- Adding Cloudera CDH5 as distro (cdh5)

- Changing Hortonworks Data Platform version 2.0 to 2.1 (hdp21)
XD-1677 Add 'level' and 'expression' to Log Sink

JIRA: https://jira.spring.io/browse/XD-1677

Use `--expression=#root` to log entire message.