Calico: update files to handle multi-asn bgp peering conditions.

[catblade]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Without these changes, multi-ASN configs will not work.

• Add in ability for kubespray to configure ASNs according to routers being peered with by the node instead of relying on the user to put in local_as for every single node.
• Add in option to have BGP configured so that we can choose to not have a global ASN. With multiple ASNs, will not work.

Tested on our little cluster with a switch. Do not see infrastructure in kubepsray proper to test this type of config (needs switch configuration to test). We have an iperf test that works with these changes.

Which issue(s) this PR fixes:

Fixes #
#6845

Special notes for your reviewer:
You may wish to talk to me directly in how to set a switch for testing.

Does this PR introduce a user-facing change?
Yes.

New item in samples shows you can choose not to set a global calico ASN, option named calico_no_global_as_num
No longer need to set local_as per-node. It will pull it in from the tors as they are defined by node. This will make changing servers between racks (or otherwise configuring) less prone to user error.

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[k8s-ci-robot]

Hi @catblade. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[catblade]

@mirwan

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: catblade, mirwan

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[mirwan]

/ok-to-test

[mirwan]

/lgtm