Add more alert details to incidentd header.

+ Add metric_id, dimension, metric_value in the incident report header
  to make it easier to identify an anomaly.
+ In case there is a uid in the dimension, put the its package info in the header too

Test: statsd_test && tested locally with a config

Change-Id: I762a1a4b0563fb3104e0d32b616b4a2367485e48
diff --git a/cmds/statsd/src/StatsService.cpp b/cmds/statsd/src/StatsService.cpp
index d23fc62..8b5fca7 100644
--- a/cmds/statsd/src/StatsService.cpp
+++ b/cmds/statsd/src/StatsService.cpp
@@ -160,7 +160,7 @@
            }
 
       }))  {
-    mUidMap = new UidMap();
+    mUidMap = UidMap::getInstance();
     mPullerManager = new StatsPullerManager();
     StatsPuller::SetUidMap(mUidMap);
     mConfigManager = new ConfigManager();