[mini-cluster] check for failures in TestKerberosReacquire
[mini-cluster] check for failures in TestKerberosReacquire

Wrapped SmokeTestKerberizedCluster() into NO_FATALS()
in ExternalMiniClusterTest.TestKerberosReacquire scenario.

Change-Id: I2790bd461cea5caf4ba03b3487600f92362ddc89
Reviewed-on: http://gerrit.cloudera.org:8080/14305
Tested-by: Alexey Serbin <864f6b82bd94e8dda64141d4274519ee66e0102e@cloudera.com>
Reviewed-by: Adar Dembo <866ca730bfc7f544e3ebce604ceeba4879f23df0@cloudera.com>

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