microshift-containerized as a systemd service using host's cri-o

[husky-parul]

Signed-off-by: Parul parsingh@redhat.com

Which issue(s) this PR addresses:
This PR partially resolves #276
microshift-containerized is running microshift as a systemd service using podman and host's cri-o

This PR

• systemd unit file for running microshift-containerized
• mounts host's cri-o as a volume on microshift-containerized

[sallyom]

@husky-parul I have a PR to update the generated unit file, you'll want to update this PR too. Otherwise upon machine restart the service fails due to container already exists with that name error. The --new flag was missing when we generated the unit file before.
Also, since podman generate systemd --new sets the ExecStart|Stop with the podman cmds, I modified the /usr/bin/microshift-script to only include the setsebool cmd, recording of the kubeconfig path, & conditional volume create and it should run with the ExecPreStart. Take a look!
#315

[husky-parul]

@sallyom ready for review

[husky-parul]

/assign @fzdarsky

[rootfs]

lgtm
/assign @oglok @mangelajo

[openshift-ci]

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In response to this:

lgtm
/assign @oglok @mangelajo

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[mangelajo]

/lgtm

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/lgtm

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[mangelajo]

@mangelajo: changing LGTM is restricted to collaborators

This is still complaining on me. ':D

[mangelajo]

/lgtm

[openshift-ci]

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