Use traceflags object

Fixes #471

Author: ocelotl

Diff for: propagator/opentelemetry-propagator-ot-trace/src/opentelemetry/propagators/ot_trace/__init__.py

@@ -85,7 +85,7 @@ def extract(
                         trace_id=int(traceid, 16),
                         span_id=int(spanid, 16),
                         is_remote=True,
-                        trace_flags=traceflags,
+                        trace_flags=TraceFlags(traceflags),
                     )
                 ),
                 context,

Diff for: propagator/opentelemetry-propagator-ot-trace/tests/test_ot_trace_propagator.py

@@ -248,6 +248,10 @@ def test_extract_trace_id_span_id_sampled_true(self):
         self.assertEqual(hex(span_context.span_id)[2:], "e457b5a2e4d86bd1")
         self.assertTrue(span_context.is_remote)
         self.assertEqual(span_context.trace_flags, TraceFlags.SAMPLED)
+        self.assertIsInstance(
+            get_current_span().get_span_context().trace_flags,
+            TraceFlags
+        )
 
     def test_extract_trace_id_span_id_sampled_false(self):
         """Test valid trace_id, span_id and sampled false"""
@@ -268,6 +272,10 @@ def test_extract_trace_id_span_id_sampled_false(self):
         self.assertEqual(hex(span_context.span_id)[2:], "e457b5a2e4d86bd1")
         self.assertTrue(span_context.is_remote)
         self.assertEqual(span_context.trace_flags, TraceFlags.DEFAULT)
+        self.assertIsInstance(
+            get_current_span().get_span_context().trace_flags,
+            TraceFlags
+        )
 
     def test_extract_malformed_trace_id(self):
         """Test extraction with malformed trace_id"""