Make some lbexec tests independent of the value of GAUDIAPPNAME

In some cases (in particular CMake builds with a super project) tests are run with an arbitrary value for the environment variable GAUDIAPPNAME.

I found two lbexec tests that assume GAUDIAPPNAME is set to LHCb, thus failing if it is not the case.

This MR changes the tests to work regardless of the value of GAUDIAPPNAME.

See gaudi/Gaudi#233 (closed) too.

GaudiConf/python/GaudiConf/LbExec/tests/test_cli.py

@@ -8,6 +8,7 @@
 # granted to it by virtue of its status as an Intergovernmental Organization  #
 # or submit itself to any jurisdiction.                                       #
 ###############################################################################
+import os
 import sys
 from pathlib import Path
 
@@ -25,6 +26,8 @@ LBEXEC_CMD = ["lbexec"]
 OPTIONS_FN = str(Path(__file__).parent / "example.yaml")
 FUNCTION_SPEC = f"{examples.__name__}:do_nothing"
 LBEXEC_EXAMPLE_CMD = LBEXEC_CMD + [FUNCTION_SPEC, OPTIONS_FN]
+WELCOME_MSG = "Welcome to {}".format(
+    os.environ.get("GAUDIAPPNAME", "ApplicationMgr"))
 
 
 @pytest.fixture
@@ -298,6 +301,6 @@ def test_valid(capfd, monkeypatch, function_spec, options_spec):
     exit_code = parse_args()
     captured = capfd.readouterr()
     assert exit_code == 0, captured
-    assert "Welcome to LHCb" in captured.out
+    assert WELCOME_MSG in captured.out
     assert "Application Manager Terminated successfully" in captured.out
     assert captured.err == ""