Remove centos-7 puppet apply infra jobs

These jobs are not used anymore, remove them.

Change-Id: If75cf471fa39620c44c08871117e706e8e1266ca

zuul.d/jobs.yaml

@@ -1450,24 +1450,12 @@
     parent: infra-puppet-apply-base
     nodeset: ubuntu-xenial
 
-- job:
-    name: infra-puppet-apply-3-centos-7
-    parent: infra-puppet-apply-base
-    nodeset: centos-7
-
 - job:
     name: infra-puppet-apply-3-ubuntu-trusty
     parent: infra-puppet-apply-base
     nodeset: ubuntu-trusty
     branches: master
 
-- job:
-    name: infra-puppet-apply-4-centos-7
-    parent: infra-puppet-apply-base
-    nodeset: centos-7
-    vars:
-      puppet_version: 4
-
 - job:
     name: infra-puppet-apply-4-ubuntu-xenial
     parent: infra-puppet-apply-base
@@ -1600,13 +1588,6 @@
     vars:
       project_src_dir: "{{ zuul.projects['opendev.org/opendev/puppet-openstackci'].src_dir }}"
 
-- job:
-    name: openstackci-beaker-centos-7
-    parent: openstackci-beaker
-    nodeset: centos-7
-    vars:
-      nodeset: nodepool-centos7
-
 - job:
     name: openstackci-beaker-ubuntu-trusty
     parent: openstackci-beaker
@@ -1623,15 +1604,6 @@
     vars:
       puppet_version: 4
 
-- job:
-    name: openstackci-beaker-puppet-4-centos-7
-    parent: openstackci-beaker-centos-7
-    description: |
-      Run beaker-rspec functional tests with puppet 4 on CentOS 7 for the
-      puppet-openstackci module.
-    vars:
-      puppet_version: 4
-
 - job:
     name: ansible-role-functional-base
     abstract: true