Pusher: Caliper: Change timestamp precision to nanosec

dcdbpusher/Caliper/patch

@@ -17,7 +17,7 @@
              sbuf->append(timestamp_attr.id(),
 -                         Variant(cali_make_variant_from_uint(chrono::system_clock::to_time_t(chrono::system_clock::now()))));
 +                         Variant(cali_make_variant_from_uint(
-+                                 chrono::duration_cast<chrono::microseconds>(chrono::system_clock::now().time_since_epoch()).count())));
++                                 chrono::duration_cast<chrono::nanoseconds>(chrono::system_clock::now().time_since_epoch()).count())));
      }
  
      void post_init_cb(Caliper* c, Channel* chn) {

dcdbpusher/sensors/caliper/CaliperSensorGroup.cpp

@@ -166,7 +166,7 @@ void CaliperSensorGroup::read() {
 
         reading_t reading;
         reading.value     = 1;
-        reading.timestamp = US_TO_NS(std::stoull(timestamp)); //Caliper timestamps are microseconds since UNIX epoch
+        reading.timestamp = std::stoull(timestamp);
 
         S_Ptr s;
         auto it = _sensorIndex.find(feName);