Fix python 3.11 job and update python classifier in setup.cfg

As per the current release tested runtime, we test
python version from 3.8 to 3.11 so updating the
same in python classifier in setup.cfg

Fixing the py311 unit test job:
- Updating bindep.txt for mysql packages
- Squash other two fixes in this commit to make job green
  1. getargspec was deprecated in Python 3.0, and it's removed in
     Python 3.11 in the favor of getfullargspec.
  2. Opening files in U mode is removed in Python 3.11. This
     fixes unit tests for me in Debian. Related Debian bug:
     https://bugs.debian.org/1025013

Co-Authored-By: Thomas Goirand <thomas@goirand.fr>

Change-Id: Ie53dc343927bc107a2445ed96a84d24d6513dc7d

bindep.txt

@@ -2,8 +2,9 @@
 # see https://docs.openstack.org/infra/bindep/ for additional information.
 
 libpq-dev [platform:dpkg]
-mysql-client [platform:dpkg]
-mysql-server [platform:dpkg]
+mysql-client [platform:dpkg !platform:debian]
+mysql-server [platform:dpkg !platform:debian]
+mariadb-server [platform:rpm platform:redhat platform:debian]
 postgresql
 postgresql-client [platform:dpkg]
 

murano/engine/system/resource_manager.py

@@ -57,7 +57,7 @@ class ResourceManager(object):
     @specs.meta(constants.META_NO_TRACE, True)
     def string(receiver, name, owner=None, binary=False):
         path = ResourceManager._get_package(owner, receiver).get_resource(name)
-        mode = 'rb' if binary else 'rU'
+        mode = 'rb' if binary else 'r'
         with open(path, mode) as file:
             return file.read()
 

murano/tests/unit/engine/test_mock_context_manager.py

@@ -72,7 +72,7 @@ class TestMockManager(base.MuranoTestCase):
         original_function.is_method = True
         original_function.name = FIXTURE_FUNC
         original_context = contexts.Context()
-        p = mock.patch("inspect.getargspec", new=mock.MagicMock())
+        p = mock.patch("inspect.getfullargspec", new=mock.MagicMock())
         p.start()
         original_context.register_function(original_function)
         mock_murano_class.context = original_context

setup.cfg

@@ -35,6 +35,9 @@ classifier =
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
 
 [files]
 packages =