tests: Remove pam-wrapper temporary folder on test completion

PAM wrapper creates /tmp/pam.X files during its execution (strictly as
it does not follow $TMPDIR either), however given the low number of
combinations, we may end up in re-using the same pam.* folder during
meson test, causing a failure.

As per this, remove these temporary files on tearDown so that we won't
try reusing the same folder multiple times.

tests/pam/test_pam_fprintd.py

@@ -18,7 +18,9 @@ import subprocess
 import dbus
 import dbusmock
 import fcntl
+import glob
 import os
+import shutil
 import time
 import pypamtest
 
@@ -68,6 +70,9 @@ class TestPamFprintd(dbusmock.DBusTestCase):
     def tearDownClass(klass):
         klass.stop_monitor()
 
+        # Remove pam wrapper files, as they may break other tests
+        [shutil.rmtree(i) for i in glob.glob('/tmp/pam.[0-9A-z]')]
+
     def setUp(self):
         (self.p_mock, self.obj_fprintd_manager) = self.spawn_server_template(
             self.template_name, {}, stdout=subprocess.PIPE)