Test that the topology script is always passed IP addresses
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Key: HADOOP-7422
URL: https://issues.apache.org/jira/browse/HADOOP-7422
Project: Hadoop Common
Issue Type: Test
Components: test
Reporter: Eli Collins
Now that HADOOP-6682 has been fixed, Hadoop should always pass the topology
script an IP address rather than a hostname. We should write a test that covers
this (specifically that DNSToSwitchMapping#resolve is always passed IP
addresses) so users can safely write topology scripts that don't handle
hostnames.
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