Ensure yum cache is ready before update

To workaround yum bug with libnss we need to make yum cache
before running update. In fact we should have done this
regardless of the bug.

Change-Id: I5b2355fb8abe3c8d4b9ce9c62b9ffdba8c1e8d9d
Resolves: rhbz#1458841
Closes-Bug: #1703830

extraconfig/tasks/yum_update.sh

@@ -64,6 +64,9 @@ fi
 
 command_arguments=${command_arguments:-}
 
+# Always ensure yum has full cache
+yum makecache || echo "Yum makecache failed. This can cause failure later on."
+
 # yum check-update exits 100 if updates are available
 set +e
 check_update=$(yum check-update 2>&1)

puppet/services/openvswitch.yaml

@@ -159,6 +159,8 @@ outputs:
                 owner: root
                 group: root
                 mode: 0750
+            - name: Make yum cache.
+              command: yum makecache
             - name: Download OVS packages.
               command: yumdownloader --destdir /root/OVS_UPGRADE --resolve openvswitch
             - name: Get rpm list for manual upgrade of OVS.