stop.sh: don't kill mvnsh.

Signed-off-by: Colin McCabe <cmccabe@alumni.cmu.edu>
When syncing the tachyon dir, avoid the logs subdir

Signed-off-by: Colin McCabe <cmccabe@alumni.cmu.edu>
add get_err.sh script for looking for YARN error logs

Signed-off-by: Colin McCabe <cmccabe@alumni.cmu.edu>
add spark-defaults.conf and spark-slaves

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