add hadoop-land.sh, a script to set up a hadoop env

Signed-off-by: Colin Patrick McCabe <cmccabe@cloudera.com>
mvn-all-347-tests: add TestBlockReaderLocalLegacy

Signed-off-by: Colin Patrick McCabe <cmccabe@cloudera.com>
hadoop-land.sh: set _JAVA_OPTS to make logfile mess go away

Signed-off-by: Colin Patrick McCabe <cmccabe@cloudera.com>