Revert "Revert "Unhide IpPrefix(InetAddress, int)""

This reverts commit 758ead6dd362f8b7c665603fb9d85038b3f72f27.

Reason for revert: Re-landing changes not related to postsubmit failure

Change-Id: I2f705549d85af4ba45dc294e0a86d757490b1cd7
4 files changed