nixos/tests/taskserver: fix eval

Since IP address options were changed for 18.03, eval has failed with:
"The option `networking.interfaces.eth1.subnetMask' is used but not defined."
although this option is not used at all in nixos anymore.

The misleading error message seems to be generated from evaluating warnings
for `mkRemovedOptionModule ["subnetMask"]` which apparently broke here
when this test inherited network.interfaces from one VM config to another.

Cc: @aszlig

0 files changed, 0 insertions, 0 deletions