feat: add util.get_home_path() function

tests/test_util.py

@@ -15,6 +15,15 @@ class TestExists(TestCase):
         c.run.assert_called_once_with('test -e /foo', warn=True)
 
 
+class TestHomePath(TestCase):
+
+    def test_basic(self):
+        c = MagicMock()
+        c.run.return_value.stdout = '/home/foo'
+        path = mod.get_home_path(c, user='foo')
+        self.assertEqual(path, '/home/foo')
+
+
 class TestIsSymlink(TestCase):
 
     def test_yes(self):