Call netd to update the tcp buffer size
The system server is controlling the tcp buffer now by writing to /sys/kernel/ipv4/tcp_{rmem,wmem}_{min,def,max}. Those files are basically the same as /proc/sys/net/ipv4/tcp_{rmem,wmem} except those latter ones contain all three values in one file. Netd can directly write to those files so we no longer need to depend on these android specific files. Test: netd_integration_test Bug: 118572798 Change-Id: I588b48be29ecf61fd5bbf94f97f63738be4eae25
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