Revert "Make tests expect error instead of previous warning"

This reverts commit 9ad55f1.

Author: Lirt

tests/cli/test_units.py

@@ -140,7 +140,7 @@ def test_raises_exception_main_function(self):
         # my attempts to mock sys.stderr didn't work with pytest
         # This will get the error message passed to logging.warning
         # as a parameter
-        with patch('logging.error') as log:
+        with patch('logging.warning') as log:
             old_argv = sys.argv
             args = ['get', '--root-dir', self.tmproot]
             sys.argv = [old_argv[0]] + args
@@ -160,7 +160,7 @@ def test_raises_exception_main_function_permission_denied(self):
 
         os.chmod(os.path.join(self.tmproot, 'etc/netplan/test.yaml'), 0)
 
-        with patch('logging.error') as log:
+        with patch('logging.warning') as log:
             old_argv = sys.argv
             args = ['get', '--root-dir', self.tmproot]
             sys.argv = [old_argv[0]] + args
@@ -177,7 +177,7 @@ def test_get_validation_error_exception(self):
     eth0:
       set-name: abc''')
 
-        with patch('logging.error') as log:
+        with patch('logging.warning') as log:
             old_argv = sys.argv
             args = ['get', '--root-dir', self.tmproot]
             sys.argv = [old_argv[0]] + args
@@ -196,7 +196,7 @@ def test_set_generic_validation_error_exception(self):
         - table: 200
           to: 1.2.3.4''')
 
-        with patch('logging.error') as log:
+        with patch('logging.warning') as log:
             old_argv = sys.argv
             args = ['get', '--root-dir', self.tmproot]
             sys.argv = [old_argv[0]] + args