Allow local gateway mode to be configured with OVN

[jluhrsen]

Signed-off-by: Jamo Luhrsen jluhrsen@gmail.com

[openshift-ci]

Hi @jluhrsen. Thanks for your PR.

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[jluhrsen]

/hold

[stbenjam]

/ok-to-test

[jluhrsen]

/retest

[jluhrsen]

/hold cancel

[jluhrsen]

@stbenjam , could you please review this? The PR as is has no effect on how the presubmit jobs are deployed. they will
take the default shared gateway mode. here is a ovnkube-master log and worker ovnkube-node log showing "shared" being
used. I also updated this PR (since removed) to put `export OVN_LOCAL_GATEWAY_MODE=local" in common.sh to
simulate that variable being available at install and you can see "local" being used in this ovnkube-master log and worker log
from this PRs presubmits.

[jluhrsen]

here's the matching PR in release/ that would create a job to take advantage of this one.

[stbenjam]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[stbenjam]

Thanks!!