[CDH5] Removal of erroneous sanity checks

The Kerberization work introduced sanity checks that ensured that
HADOOP_LZO and IMPALA_LZO were set in the environment.  However, the
packaging builds don't have those set.  This submittal removes those
newly added checks.

Change-Id: I08ae867e00e99e244221b32158724b06ee9fb901
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4194
Reviewed-by: Ishaan Joshi <ishaan@cloudera.com>
Tested-by: jenkins