copr-builder: exclude infra mock => allow installing mock 1.4.8 from Fedora

roles/copr/backend/files/provision/files/dnf/infra-tags-stg.repo

@@ -4,3 +4,4 @@ baseurl=https://kojipkgs.fedoraproject.org/repos-dist/f$releasever-infra-stg/lat
 enabled=1
 gpgcheck=1
 gpgkey=https://infrastructure.fedoraproject.org/repo/infra/RPM-GPG-KEY-INFRA-TAGS
+exclude=mock

roles/copr/backend/files/provision/files/dnf/infra-tags.repo

@@ -4,3 +4,4 @@ baseurl=https://kojipkgs.fedoraproject.org/repos-dist/f$releasever-infra/latest/
 enabled=1
 gpgcheck=1
 gpgkey=https://infrastructure.fedoraproject.org/repo/infra/RPM-GPG-KEY-INFRA-TAGS
+exclude=mock

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

@@ -19,10 +19,6 @@
 - name: set bigger timeout for dnf
   ini_file: dest=/etc/dnf/dnf.conf section=main option=timeout value=1000
 
-# hack for 2:mock-1.3.4-2 currently being the latest version in infra repos
-- name: ensure absent
-  dnf: state=absent pkg="mock-core-configs"
-
 - name: install pkgs
   dnf: state=present pkg={{ item }}
   with_items:
@@ -59,12 +55,6 @@
 - name: put updated mock configs into /etc/mock
   template: src=files/mock/{{ item }} dest=/etc/mock
   with_items:
-    - mageia-cauldron-i586.cfg
-    - mageia-cauldron-x86_64.cfg
-    - fedora-26-ppc64le.cfg
-    - fedora-27-i386.cfg
-    - fedora-27-ppc64le.cfg
-    - fedora-27-x86_64.cfg
     - site-defaults.cfg
 
 - name: put copr-rpmbuild configuration file in the right place