Use assertRegex instead of assertRegexpMatches

I get these warnings when running against Python 3.7.4:

    tests/plugins/src.ctf.fs/query/test_query_trace_info.py:192: DeprecationWarning: Please use assertRegex instead.

Change-Id: I77cf2efc7aa74c4e4138e08c3ac1b9e618b718cd
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/2215
Reviewed-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Tested-by: jenkins <jenkins@lttng.org>

tests/plugins/src.ctf.fs/query/test_query_trace_info.py

@@ -155,13 +155,13 @@ def test_trace_uuid_stream_class_id_no_stream_id(self):
         trace = res[0]
         streams = sorted(trace["stream-infos"], key=sort_predictably)
         self.assertEqual(len(streams), 2)
-        self.assertRegexpMatches(
+        self.assertRegex(
             str(streams[0]["port-name"]),
             r"^7afe8fbe-79b8-4f6a-bbc7-d0c782e7ddaf \| 0 \| .*"
             + re.escape(str(os_stream_path / "test_stream_0"))
             + r"$",
         )
-        self.assertRegexpMatches(
+        self.assertRegex(
             str(streams[1]["port-name"]),
             r"^7afe8fbe-79b8-4f6a-bbc7-d0c782e7ddaf \| 0 \| .*"
             + re.escape(str(os_stream_path / "test_stream_1"))
@@ -185,7 +185,7 @@ def test_trace_uuid_no_stream_class_id_no_stream_id(self):
         trace = res[0]
         streams = sorted(trace["stream-infos"], key=sort_predictably)
         self.assertEqual(len(streams), 1)
-        self.assertRegexpMatches(
+        self.assertRegex(
             str(streams[0]["port-name"]),
             r"^2a6422d0-6cee-11e0-8c08-cb07d7b3a564 \| .*"
             + re.escape(str(os_stream_path))