Bug 1915926: Update ose-openstack-machine-controllers builder & base images to be consistent with ART

Author: pierreprinetti

Dockerfile

@@ -1,9 +1,9 @@
-FROM registry.svc.ci.openshift.org/openshift/release:golang-1.13 AS builder
+FROM registry.ci.openshift.org/openshift/release:golang-1.15 AS builder
 WORKDIR /go/src/sigs.k8s.io/cluster-api-provider-openstack
 COPY . .
 
 RUN go build -o ./machine-controller-manager ./cmd/manager
 
-FROM registry.svc.ci.openshift.org/openshift/origin-v4.0:base
+FROM registry.ci.openshift.org/openshift/origin-v4.7:base
 
 COPY --from=builder /go/src/sigs.k8s.io/cluster-api-provider-openstack/machine-controller-manager /

Dockerfile.rhel

@@ -1,10 +1,10 @@
-FROM registry.svc.ci.openshift.org/ocp/builder:rhel-8-golang-1.15-openshift-4.7 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.15-openshift-4.7 AS builder
 WORKDIR /go/src/sigs.k8s.io/cluster-api-provider-openstack
 COPY . .
 
 RUN go build -o ./machine-controller-manager ./cmd/manager
 
-FROM registry.svc.ci.openshift.org/ocp/4.7:base
+FROM registry.ci.openshift.org/ocp/4.7:base
 RUN INSTALL_PKGS=" \
       openssh \
       " && \