Add oc client binary to microshift-aio, set KUBECONFIG

[sallyom]

Which issue(s) this PR addresses:

Closes #474 #477

This oc 4.8.9 to the microshift-aio image from here

Also, sets KUBECONFIG within the microshift-aio image

[fzdarsky]

/lgtm

[openshift-ci]

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[thinkahead]

This is hardcoded to use amd64, it needs to be changed to use $ARCH. Also need to use newer OCP_VERSION that is available for aarch64

-RUN export OCP_VERSION=4.8.9 && \
-    curl -o oc.tar.gz https://mirror2.openshift.com/pub/openshift-v4/amd64/clients/ocp/$OCP_VERSION/openshift-client-linux-$OCP_VERSION.tar.gz && \
+RUN export OCP_VERSION=4.9.11 && \
+    curl -o oc.tar.gz https://mirror2.openshift.com/pub/openshift-v4/$ARCH/clients/ocp/$OCP_VERSION/openshift-client-linux-$OCP_VERSION.tar.gz && \

[sallyom]

@thinkahead thanks for that! I've opened a PR, although, would also accept a PR from you. #512