Don't install centos-release-openstack-ocata

This was brought in with puppet work in
Ia9c45b762eea9f2989c9c63fb944b9e5e1f17ed2 but we do not want it in the
base centos 7 image.  bindep-fallback packages relying on it have been
removed with Iab9495bd381b135e8a0f2e8f35e51a9218cf8f40.  I have done a
local build with this and there's no other hidden dependencies relying
on this within the image creation AFAICS.

Change-Id: I747c2b8754effbc6ec82af3bf7543fd9599a6c14

nodepool/elements/infra-package-needs/package-installs.yaml

@@ -28,7 +28,6 @@ iproute2:
 dnsutils:
 haveged:
 iptables:
-centos-release-openstack-ocata:
 redhat-rpm-config:
 redhat-lsb-core:
 curl:

nodepool/elements/infra-package-needs/pkg-map

@@ -22,9 +22,6 @@
       "tox": "dev-python/tox",
       "traceroute": "net-analyzer/traceroute",
       "uuid-runtime": ""
-    },
-    "centos": {
-      "centos-release-openstack-ocata": "centos-release-openstack-ocata"
     }
   },
   "family": {
@@ -59,7 +56,6 @@
     "curl": "curl",
     "iptables": "iptables-persistent",
     "gentoolkit": "",
-    "centos-release-openstack-ocata": "",
     "redhat-rpm-config": "",
     "redhat-lsb-core": "",
     "python-xml": "",