IMPALA-7119: Restart whole minicluster when HDFS replication stalls
IMPALA-7119: Restart whole minicluster when HDFS replication stalls

After loading data, we wait for HDFS to replicate
all of the blocks appropriately. If this takes too long,
we restart HDFS. However, HBase can fail if HDFS is
restarted and HBase is unable to write its logs.
In general, there is no real reason to keep HBase
and the other minicluster components running while
restarting HDFS.

This changes the HDFS health check to restart the
whole minicluster and Impala rather than just HDFS.

Testing:
 - Tested with a modified version that always does
   the restart in the HDFS health check and verified
   that the tests pass

Change-Id: I58ffe301708c78c26ee61aa754a06f46c224c6e2
Reviewed-on: http://gerrit.cloudera.org:8080/10665
Reviewed-by: Impala Public Jenkins <039b6b20426ff68ebe492b3021890d8c8fd010c9@cloudera.com>
Tested-by: Impala Public Jenkins <039b6b20426ff68ebe492b3021890d8c8fd010c9@cloudera.com>

cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala