Due to an issue resolving the boot classpath, the
KeepalivePacketData structure cannot be referenced
by frameworks/opt/telephony while it is in services.
-Move KeepalivePacketData to android.net
-Also, relocate IpUtils without changing the package
name.
Bug: 38350389
Test: compilation
Merged-In: If5fc63e9ad8b9b2d4c2fee47ff4bab2ab190a05a
Change-Id: If5fc63e9ad8b9b2d4c2fee47ff4bab2ab190a05a
(cherry picked from commit 41002e3080461ba6a7aee12c1d12dd13edc8626c)
26de1d3b90