Reduce net consumption

[alonSadan]

This PR tries to reduce the net consumption done by the ovs-bridge-marker. This PR introduces the same changes done in CNI-bridge:

• increasing the update interval
• use cache to keep track on the available bridges
• use a jitter to avoid network peeks.

[kubevirt-bot]

Hi @alonSadan. Thanks for your PR.

I'm waiting for a k8snetworkplumbingwg member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[alonSadan]

/test pull-e2e-ovs-cni

[kubevirt-bot]

@alonSadan: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to [this](https://github.com/k8snetworkplumbingwg/ovs-cni/pull/186#issuecomment-890850658): >/test pull-e2e-ovs-cni Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[phoracek]

/ok-to-test

[alonSadan]

/test pull-e2e-ovs-cni

[alonSadan]

/test pull-e2e-ovs-cni

[alonSadan]

/test pull-e2e-ovs-cni

[alonSadan]

/test pull-e2e-ovs-cni

[alonSadan]

/test pull-e2e-ovs-cni

[phoracek]

/lgtm /approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alonSadan, phoracek

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/k8snetworkplumbingwg/ovs-cni/blob/main/OWNERS)~~ [phoracek] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[alonSadan]

/lgtm /approve

Thank you Petr

[phoracek]

/release-note-none