k8s_fedora: Bump up default kube_tag to v1.15.7

Also bump up cloud_provider_tag to v1.15.0.

This is the common supported version in Fedora Atomic (now EOL) when
`use_podman=true` label is not supplied.

Task: 37817
Story: 2005380

Change-Id: I4afaf159eaf2d2ff75bd3abec4137257e0daa8f2
Signed-off-by: Bharat Kunwar <brtknr@bath.edu>

doc/source/user/index.rst

@@ -1216,6 +1216,7 @@ _`cloud_provider_tag`
   the cloud-provider. The images are hosted `here
   <https://hub.docker.com/r/k8scloudprovider/openstack-cloud-controller-manager/tags/>`_.
   Stein default: v0.2.0
+  Train default: v1.15.0
 
 _`etcd_tag`
   This label allows users to select `a specific etcd version,

magnum/drivers/k8s_fedora_atomic_v1/templates/kubecluster.yaml

@@ -432,17 +432,17 @@ parameters:
   kube_tag:
     type: string
     description: tag of the k8s containers used to provision the kubernetes cluster
-    default: v1.14.3
+    default: v1.15.7
 
   master_kube_tag:
     type: string
     description: tag of the k8s containers used to provision the kubernetes cluster
-    default: v1.14.3
+    default: v1.15.7
 
   minion_kube_tag:
     type: string
     description: tag of the k8s containers used to provision the kubernetes cluster
-    default: v1.14.3
+    default: v1.15.7
 
   # FIXME update cloud_provider_tag when a fix for PVC is released
   # https://github.com/kubernetes/cloud-provider-openstack/pull/405
@@ -451,7 +451,7 @@ parameters:
     description:
       tag of the kubernetes/cloud-provider-openstack
       https://hub.docker.com/r/k8scloudprovider/openstack-cloud-controller-manager/tags/
-    default: v1.14.0
+    default: v1.15.0
 
   cloud_provider_enabled:
     type: boolean
@@ -480,7 +480,7 @@ parameters:
   kube_version:
     type: string
     description: version of kubernetes used for kubernetes cluster
-    default: v1.14.3
+    default: v1.15.7
 
   kube_dashboard_version:
     type: string

magnum/drivers/k8s_fedora_coreos_v1/templates/kubecluster.yaml

@@ -432,17 +432,17 @@ parameters:
   kube_tag:
     type: string
     description: tag of the k8s containers used to provision the kubernetes cluster
-    default: v1.14.3
+    default: v1.15.7
 
   master_kube_tag:
     type: string
     description: tag of the k8s containers used to provision the kubernetes cluster
-    default: v1.14.3
+    default: v1.15.7
 
   minion_kube_tag:
     type: string
     description: tag of the k8s containers used to provision the kubernetes cluster
-    default: v1.14.3
+    default: v1.15.7
 
   # FIXME update cloud_provider_tag when a fix for PVC is released
   # https://github.com/kubernetes/cloud-provider-openstack/pull/405
@@ -451,7 +451,7 @@ parameters:
     description:
       tag of the kubernetes/cloud-provider-openstack
       https://hub.docker.com/r/k8scloudprovider/openstack-cloud-controller-manager/tags/
-    default: v1.14.0
+    default: v1.15.0
 
   cloud_provider_enabled:
     type: boolean
@@ -480,7 +480,7 @@ parameters:
   kube_version:
     type: string
     description: version of kubernetes used for kubernetes cluster
-    default: v1.14.3
+    default: v1.15.7
 
   kube_dashboard_version:
     type: string