Fixup: pr header value test

Author: hmstepanek

tests/framework_grpc/test_distributed_tracing.py

@@ -138,6 +138,11 @@ def _test():
             decoded["d"].pop("tk", None)
             w3c_data.pop("tk")
 
+            # Round priority of newrelic header to 6 decimal places so it match tracestate.
+            pr = decoded.get("pr", None)
+            if pr:
+                decoded["pr"] = float(f"{pr:.6f}")
+
             assert decoded["d"] == w3c_data
 
     _test()