Miguel Lavalle d5b4f242d4 Document dns_domain for ports attribute
This commit adds to the Networking Guide chapter for DNS integration the
workings of the dns_domain attribute for ports.

Change-Id: Ib775fe3d44b766c457875a04460ad90d1e377974
Closes-Bug: #1710203
2017-09-03 18:54:28 -05:00
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