More statvfs info for mount facts rebase 12073 (#25454)

* Add more mount point statvfs info including sizes

Based on https://github.com/ansible/ansible/pull/12073

facts.utils.get_mount_size() now returns a dict of most
of the posix statvfs data, including block_size and inode
counts.

Update the facts.hardware classes that use get_mount_size() to
use the new info by mount_info.update(mount_statvfs_inof) to merge.

* add back unit tests for LinuxHardware mount/fs facts

* add test cases for facts.utils.get_mount_size

test/units/module_utils/facts/test_utils.py

@@ -0,0 +1,39 @@
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# Make coding more python3-ish
+from __future__ import (absolute_import, division)
+__metaclass__ = type
+
+from ansible.compat.tests import unittest
+from ansible.compat.tests.mock import patch
+
+from ansible.module_utils.facts import utils
+
+
+class TestGetMountSize(unittest.TestCase):
+    def test(self):
+        mount_info = utils.get_mount_size('/dev/null/not/a/real/mountpoint')
+        self.assertIsInstance(mount_info, dict)
+
+    def test_proc(self):
+        mount_info = utils.get_mount_size('/proc')
+        self.assertIsInstance(mount_info, dict)
+
+    @patch('ansible.module_utils.facts.utils.os.statvfs', side_effect=OSError('intentionally induced os error'))
+    def test_oserror_on_statvfs(self, mock_statvfs):
+        mount_info = utils.get_mount_size('/dev/null/doesnt/matter')
+        self.assertIsInstance(mount_info, dict)
+        self.assertDictEqual(mount_info, {})