lint: Enable flake8-executable

* Remove exectuable flag from a couple of files
* Half of the test files have a shebang (but are
  still not executable): remove the shebang

Signed-off-by: Jussi Kukkonen <jkukkonen@google.com>

Author: jku

pyproject.toml

@@ -90,6 +90,7 @@ select = [
     "D",   # pydocstyle
     "DTZ", # flake8-datetimez
     "E",   # pycodestyle
+    "EXE", # flake8-executable
     "F",   # pyflakes
     "I",   # isort
     "ISC", # flake8-implicit-str-concat

tests/__init__.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright 2021, New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 

tests/repository_simulator.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright 2020, New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 """Unit tests for api/metadata.py"""

tests/test_api.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # Copyright 2020, New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 """Unit tests for 'examples' scripts."""

tests/test_examples.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright 2021, New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 

tests/test_fetcher_ng.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 

tests/test_metadata_eq_.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright 2021, New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 

tests/test_updater_consistent_snapshot.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright 2021, New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 

tests/test_updater_delegation_graphs.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright 2021, New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0