feat!: Set default host address value to localhost.

[marqc]

Usage of localhost is family agnostic and will work regardless if cluster is IPv4 or IPv6. The current value of 127.0.0.1 only works for IPv4 clusters.

BREAKING CHANGE: It may break in rare cases where localhost does not resolve as 127.0.0.1 (if OS config does not follow RFC5735 and RFC6761).

Fixes #1060.

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Hi @marqc. Thanks for your PR.

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[aojea]

/ok-to-test

[marqc]

e2e test failures are most likely unrelated. They doesn't look like the result of this change.

[SergeyKanzhelev]

/assign @wangzhen127

[wangzhen127]

/retest

@marqc can you fix the invalid commit message issue?

[marqc]

/retest

[SergeyKanzhelev]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: marqc, SergeyKanzhelev

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