Add get_primary_ip function to imix.

[hulto]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Enables Imix to determine it's own IP address in anticipation of graphql API changes.

Which issue(s) this PR fixes:

Fixes #149

[codecov]

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[KCarretto]

Would be good to ensure this doesn't break if ipv4 is an empty array, but accepting to unblock.