Add more locks and comments for TrafficController
Add additional comments for the locking design inside TrafficController and include the cookieTagMap and uidCounterSetMap into lock protection to make the TrafficController safer for concurrent access. Bug: 130334320 Test: netd_unit_test Change-Id: I9194cdea2449dcf9b62cf00eab4bee48c09e6c84 Merged-In: I9194cdea2449dcf9b62cf00eab4bee48c09e6c84 (cherry picked from commit f01f5307)
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