reload the changes in dns.resolv_conf
-------------------------------------
Key: TS-1001
URL: https://issues.apache.org/jira/browse/TS-1001
Project: Traffic Server
Issue Type: Wish
Components: DNS
Reporter: Conan Wang
Priority: Trivial
a trivial wish: ATS can reload (traffic_line -x) resolv.conf if nameserver
changed.
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