Default the Canal MTU to 1450 when the v1alpha1 API is used and add the Canal MTU field to the example config

[xmudrii]

What this PR does / why we need it:

• Default the Canal MTU to 1450 when the v1alpha1 API is used. This fixes the issue preventing validation to pass when the v1alpha1 manifest is used
• Add the Canal MTU field to the example config

Does this PR introduce a user-facing change?:

Default the Canal MTU to 1450 when the v1alpha1 API is used. This fixes the issue preventing validation to pass when the v1alpha1 manifest is used

/assign @kron4eg

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xmudrii

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[kubermatic-bot]

LGTM label has been added.

Git tree hash: 5dfa0315d947f3679ec3697dd7213c2e9658973d

[xmudrii]

/retest

[xmudrii]

/cherry-pick release/v1.0

[kubermatic-bot]

@xmudrii: once the present PR merges, I will cherry-pick it on top of release/v1.0 in a new PR and assign it to you.

In response to this:

/cherry-pick release/v1.0

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[kubermatic-bot]

@xmudrii: new pull request created: #1018

In response to this:

/cherry-pick release/v1.0

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.