fix: ci/cfengine-build-host-setup.cf adjusted to not install epel-release-latest rpm on centos-6 platforms

Ticket: ENT-13763
Changelog: none

Author: craigcomstock

ci/cfengine-build-host-setup.cf

@@ -253,7 +253,7 @@ bundle agent cfengine_build_host_setup
     (redhat_8|centos_8).!have_fakeroot:: # special fakeroot, missing from _8 an d up?
       "sudo rpm -iv https://kojipkgs.fedoraproject.org//packages/fakeroot/1.23/1.fc29/x86_64/fakeroot-1.23-1.fc29.x86_64.rpm https://kojipkgs.fedoraproject.org//packages/fakeroot/1.23/1.fc29/x86_64/fakeroot-libs-1.23-1.fc29.x86_64.rpm"
         contain => in_shell;
-    (redhat|centos).!(redhat_7|centos_7).!epel_release_ok::
+    (redhat|centos).!(redhat_7|centos_7).!(redhat_6|centos_6).!epel_release_ok::
       "yum install --assumeyes https://dl.fedoraproject.org/pub/epel/epel-release-latest-${sys.os_version_major}.noarch.rpm"
         comment => "rhel-7 installs this with a packages promise. TODO: check a sha for the download URL somehow?",
         classes => results( "bundle", "epel_release" ),