✨ Allow overriding facility

[jhead-slg]

What this PR does / why we need it:

Allows the ability to override the facility per PacketMachineTemplate. Use case would be to launch a MachineDeployment into another datacenter but still be connected to the primary cluster.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #228

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[detiber]

Please run make generate crds, this will generate the deep copy code and crd yaml needed for the type change.

I can run some tests for this tomorrow morning. Tagging in @gianarb in case he can do some testing during EU hours before I'm back online.

[jhead-slg]

I've made the requested changes. Working on the CLA approval.

[jhead-slg]

CLA signed.

[detiber]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: detiber, jhead-slg

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