test: use bind manifest / hostname for DNS visibility test
test: use bind manifest / hostname for DNS visibility test

This allows for testing of DNS traffic without having to reach outside of the
local environment, which should make this test more stable in case there are
issues connecting externally to the testing environment which are not related
to Cilium's functionality.

Signed-off by: Ian Vernon <ian@cilium.io>

tklauser/cilium,tklauser/cilium,cilium-team/cilium,tgraf/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,tgraf/cilium,cilium/cilium,cilium-team/cilium,michi-covalent/cilium