anchor.diff:  with the `-treatFailureAsError` option. When enabled, read / write failure would result in error
   exit code.
   ----
  -$ ${HBASE_HOME}/bin/hbase canary --treatFailureAsError
  +$ ${HBASE_HOME}/bin/hbase canary -treatFailureAsError
   ----
   
   ==== Running Canary in a Kerberos-enabled Cluster
  
positive.code:   <value>/etc/hbase/conf/keytab.krb5</value>
  </property>
  <!-- optional params -->
  property>
    <name>hbase.client.dns.interface</name>
    <value>default</value>
  </property>
  
negative.code: $ ${HBASE_HOME}/bin/hbase canary -daemon
  ----
  
  Run repeatedly with 5 second intervals and will not stop itself even if errors occur in the test.
  
  ----
  $ ${HBASE_HOME}/bin/hbase canary -daemon -interval 5 -f false
  ----
  
  ==== Force timeout if canary test stuck
  