Export remaining utilities in ip_address.h.
Export remaining utilities in ip_address.h.

Allow other components to use these utilities via NET_EXPORT.

BUG= internal b/27845398

Review-Url: https://codereview.chromium.org/1966573002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#392927}

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