no need to use separate config for EPEL7

they are already in mock

roles/copr/backend/files/provision/files/mock/epel-7-x86_64.cfg

@@ -1,60 +0,0 @@
-config_opts['root'] = 'epel-7-x86_64'
-config_opts['target_arch'] = 'x86_64'
-config_opts['legal_host_arches'] = ('x86_64',)
-config_opts['chroot_setup_cmd'] = 'install @buildsys-build'
-config_opts['dist'] = 'el7'  # only useful for --resultdir variable subst
-config_opts['releasever'] = '7'
-
-config_opts['yum.conf'] = """
-[main]
-cachedir=/var/cache/yum
-debuglevel=1
-reposdir=/dev/null
-logfile=/var/log/yum.log
-retries=20
-obsoletes=1
-gpgcheck=0
-assumeyes=1
-syslog_ident=mock
-syslog_device=
-
-# repos
-[base]
-name=BaseOS
-mirrorlist=http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os
-failovermethod=priority
-
-[updates]
-name=updates
-enabled=1
-mirrorlist=http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=updates
-failovermethod=priority
-
-[epel]
-name=epel
-mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-7&arch=x86_64
-failovermethod=priority
-
-[extras]
-name=extras
-mirrorlist=http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=extras
-failovermethod=priority
-
-[testing]
-name=epel-testing
-enabled=0
-mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=testing-epel7&arch=x86_64
-failovermethod=priority
-
-[local]
-name=local
-baseurl=http://kojipkgs.fedoraproject.org/repos/epel7-build/latest/x86_64/
-cost=2000
-enabled=0
-
-[epel-debug]
-name=epel-debug
-mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-debug-7&arch=x86_64
-failovermethod=priority
-enabled=0
-"""

roles/copr/backend/templates/provision/builderpb.yml

@@ -88,7 +88,6 @@
     action: copy src={{ files }}/mock/{{ item }} dest=/etc/mock
     with_items:
     - site-defaults.cfg
-    - epel-7-x86_64.cfg
 
   - lineinfile: dest=/root/.bashrc line="ulimit -n 10240" insertafter=EOF
 {% endraw %}