Create sysconfig mount for kubernetes controller mgr

Since the kubernetes controller manager has been moved to a separate
pod, that pod needs to have access to /etc/sysconfig/kube_openstack_config
in order for the kubernetes load balancer feature to work. The
kube_openstack_config file contains the Kubernetes load balancer
configuration as well as the OpenStack credentials for the Neutron
client.

Note that as an alternative to this proposed fix, we could instead
change the Magnum developer's documentation for using the kubernetes
external load balancer feature to suggest having the cluster administrator
set up the mount point dynamically.

Change-Id: I407f5c7ba2069906f7bdbc4abb1c7618fa1e08e8
Partial-Bug: #1524025

magnum/drivers/common/templates/kubernetes/fragments/enable-kube-podmaster.sh

@@ -107,6 +107,9 @@ spec:
     - mountPath: /etc/ssl/certs
       name: ssl-certs-host
       readOnly: true
+    - mountPath: /etc/sysconfig
+      name: sysconfig
+      readOnly: true
   hostNetwork: true
   volumes:
   - hostPath:
@@ -115,6 +118,9 @@ spec:
   - hostPath:
       path: /etc/ssl/certs
     name: ssl-certs-host
+  - hostPath:
+      path: /etc/sysconfig
+    name: sysconfig
 EOF
     }
 

magnum/drivers/k8s_coreos_v1/templates/fragments/enable-kube-controller-manager.yaml

@@ -24,6 +24,7 @@ write_files:
 
       KUBE_CERTS_PATH=/etc/kubernetes/ssl
       HOST_CERTS_PATH=/usr/share/ca-certificates
+      SYSCONFIG_PATH=/etc/sysconfig
 
       SERVICE_ACCOUNT_PRIVATE_KEY_FILE=${KUBE_CERTS_PATH}/apiserver-key.pem
       ROOT_CA_FILE=${KUBE_CERTS_PATH}/ca.pem
@@ -67,6 +68,9 @@ write_files:
           - mountPath: /etc/ssl/certs
             name: ssl-certs-host
             readOnly: true
+          - mountPath: /etc/sysconfig
+            name: sysconfig
+            readOnly: true
         volumes:
         - hostPath:
             path: ${KUBE_CERTS_PATH}
@@ -74,4 +78,7 @@ write_files:
         - hostPath:
             path: ${HOST_CERTS_PATH}
           name: ssl-certs-host
+        - hostPath:
+            path: ${SYSCONFIG_PATH}
+          name: sysconfig
       EOF