Add log source filtering in statsd to filter out spams.

+ Add log source whitelist in StatsdConfig
+ Some changes in UidMap API. Listener needs to be wp instead of sp.
+ Update dogfood app config to have log source
+ Increase the stats service thread pool size to 10 (9+1).

TODO: add unit tests(b/70805664). This unit test takes some time to write.

Test: statsd_test & manual

Change-Id: I129b1cc13db5114db7417580962bd7cc4438519d
diff --git a/cmds/statsd/tests/StatsLogProcessor_test.cpp b/cmds/statsd/tests/StatsLogProcessor_test.cpp
index a5c8875..9b96bb7 100644
--- a/cmds/statsd/tests/StatsLogProcessor_test.cpp
+++ b/cmds/statsd/tests/StatsLogProcessor_test.cpp
@@ -41,7 +41,7 @@
  */
 class MockMetricsManager : public MetricsManager {
 public:
-    MockMetricsManager() : MetricsManager(ConfigKey(1, "key"), StatsdConfig(), 1000) {
+    MockMetricsManager() : MetricsManager(ConfigKey(1, "key"), StatsdConfig(), 1000, new UidMap()) {
     }
 
     MOCK_METHOD0(byteSize, size_t());