Move Inet[4]AddressUtils to libs/net

The classes should not be picked up from frameworks/base, as they are
part of several mainline modules.

Also refine comments in DhcpResults following feedback in previous
change.

(cherry-pick from internal branch skipping wifi classes; no other
conflict)

Bug: 151052811
Test: m; manual: flashed, wifi and telephony working
Test: atest NetworkStackCoverageTests
Merged-In: I7074651c6a2a7a6b11bcf13cc4bb03833d7d655f

Change-Id: I7074651c6a2a7a6b11bcf13cc4bb03833d7d655f
diff --git a/Tethering/jarjar-rules.txt b/Tethering/jarjar-rules.txt
index 2c4059d..591861f 100644
--- a/Tethering/jarjar-rules.txt
+++ b/Tethering/jarjar-rules.txt
@@ -1,17 +1,8 @@
 # These must be kept in sync with the framework-tethering-shared-srcs filegroup.
-# If there are files in that filegroup that do not appear here, the classes in the
+# Classes from the framework-tethering-shared-srcs filegroup.
+# If there are files in that filegroup that are not covered below, the classes in the
 # module will be overwritten by the ones in the framework.
-# Don't jar-jar the entire package because tethering still use some internal classes
-# (like TrafficStatsConstants in com.android.internal.util)
-# TODO: simply these when tethering is built as system_current.
-rule com.android.internal.util.BitUtils* com.android.networkstack.tethering.util.BitUtils@1
-rule com.android.internal.util.IndentingPrintWriter.java* com.android.networkstack.tethering.util.IndentingPrintWriter.java@1
-rule com.android.internal.util.IState.java* com.android.networkstack.tethering.util.IState.java@1
-rule com.android.internal.util.MessageUtils* com.android.networkstack.tethering.util.MessageUtils@1
-rule com.android.internal.util.State* com.android.networkstack.tethering.util.State@1
-rule com.android.internal.util.StateMachine* com.android.networkstack.tethering.util.StateMachine@1
-rule com.android.internal.util.TrafficStatsConstants* com.android.networkstack.tethering.util.TrafficStatsConstants@1
-
+rule com.android.internal.util.** com.android.networkstack.tethering.util.@1
 rule android.util.LocalLog* com.android.networkstack.tethering.util.LocalLog@1
 
 rule android.net.shared.Inet4AddressUtils* com.android.networkstack.tethering.shared.Inet4AddressUtils@1