Add overflow protection for network stats maps
Since we moved both uid stats and uid tag stats to the same map now. It is possible for apps to create as many tags as possible to overflow the uid tag stats map. To prevent that, add a check when tagging a socket, and start to block request when a uid created to many entries in the stats map. Bug: 111441138 Test: android.app.usage.cts.NetworkUsageStatsTest android.net.cts.TrafficStatsTest Change-Id: I11f42ffc83efc917ac0871a0326375031ae0a6e0
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