[CDH5] Fix Zookeeper classpath issue that caused failures in wait-for-hbase-master.py

Zookeeper was not executing properly in wait-for-hbase-master due to issue with the
classpath that is generated by set-classpath.sh. To fix this problem, set the classpath
using "hadoop classpath". This allows us to properly wait for hbase-master to come online.

Change-Id: Ic39be1f5ab7997e74092471042ca88f335115be0
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4255
Reviewed-by: Lenni Kuff <lskuff@cloudera.com>
Tested-by: Lenni Kuff <lskuff@cloudera.com>