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 f8a2bc3eee)
Also audit all constants, make some private, annotate some
with @VisibleForTesting.
Test: runtest framework && cts
Change-Id: Iaf5ea7abd36fd8d544dcc84654f6cb529196d654