format the instance metadata details log

[kmala]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Formats the instance metadata log message properly such that its easier to look for the details.
Before : instance metadata identityregionus-west-2availability-zoneus-west-2ainstance-typem5.largearchitecturex86_64instance-idi-0b0e5f62cc663a8b9private-ip172.16.59.42account-idxxxximage-idami-089dfc7e6aaa02c83
After : instance metadata identity" region="us-west-2" availability-zone="us-west-2a" instance-type="m5.large" architecture="x86_64" instance-id="i-0b0e5f62cc663a8b9" private-ip="172.16.59.42" account-id="xxx" image-id="ami-089dfc7e6aaa02c83

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[dims]

/approve
/lgtm

thanks @kmala

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