Revert "remove dep on dnspython as it appears to be unused"
Revert "remove dep on dnspython as it appears to be unused"

This reverts commit 6e7d5e71938d337e37dc9251416e1655a9ffeb4a.

sjones4/eutester,nephomaniac/eutester,nephomaniac/eutester,sjones4/eutester,nephomaniac/eutester,sjones4/eutester,nagyistoce/eutester,nephomaniac/nephoria,sjones4/eutester,shaon/eutester,nagyistoce/eutester,tbeckham/eutester,nagyistoce/eutester,nagyistoce/eutester,tbeckham/eutester,tbeckham/eutester,nephomaniac/nephoria,shaon/eutester,shaon/eutester,tbeckham/eutester,shaon/eutester