copr-builders: remove OSUOSL DNS hack

We were informed that the broken DNS server was removed from the DHCP
configuration.

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -8,15 +8,6 @@
     - "'s390x' in lookup('env', 'RESALLOC_NAME')"
     - copr_builder_fedora_version == 34
 
-- name: drop extremely slow libvirt resolver
-  lineinfile:
-    dest: /etc/resolv.conf
-    regexp: 'nameserver 192.168.122.1'
-    state: 'absent'
-  when:
-    - prepare_base_image is not defined
-    - "'osuosl' in lookup('env', 'RESALLOC_NAME')"
-
 - name: setup the hostname so we can easily identify the box
   hostname: name="{{ lookup('env', 'RESALLOC_NAME') | default('unknown-builder') | replace('_', '-') }}"
   when: prepare_base_image is not defined