Revert "Include libnet-dns-perl with ferm.  It's needed for certain ferm functions."

This reverts commit acd578a2b70865425589f06b9b3167f6719f3012.

This causes package conflicts; needs to be done another way.

Change-Id: I53969cb8408fe81b4de1f9cda047614336a5f154
Merge "Revert "Include libnet-dns-perl with ferm.  It's needed for certain ferm functions."" into production