Remove line number from invocation logs

line numbers are useful for debugging, but the benefit does not
compensate for the painful update of lines in files at each commit
that changes line numbers.
So I have removed those lines only for the test_invocation logs case.

Signed-off-by: EstherLerouzic <esther.lerouzic@orange.com>
Change-Id: Ic1f628d80b204a9a098f3902ebdfd10b480c7613

tests/test_invocation.py

@@ -2,7 +2,7 @@
 
 from pathlib import Path
 import os
-from logging import INFO
+from logging import INFO, Formatter
 import pytest
 import subprocess
 from gnpy.tools.cli_examples import transmission_main_example, path_requests_run
@@ -34,6 +34,9 @@ def test_example_invocation(capfd, caplog, output, log, handler, args):
     """Make sure that our examples produce useful output"""
     os.chdir(SRC_ROOT)
     expected = open(SRC_ROOT / 'tests' / 'invocation' / output, mode='r', encoding='utf-8').read()
+    formatter = Formatter('%(levelname)-9s%(name)s:%(filename)s %(message)s')
+    caplog.handler.setFormatter(formatter)
+    # keep INFO level to at least test those logs once
     caplog.set_level(INFO)
     handler(args)
     captured = capfd.readouterr()