Fixes to get example running. Start adding test.

test/requirements.txt

@@ -0,0 +1 @@
+pytest

test/test_machine_setup.py

@@ -0,0 +1,11 @@
+from machine_admin.util import set_is_dry_run
+from machine_admin.user import User
+from machine_admin.machine import Machine
+
+set_is_dry_run(True)
+
+def test_machine_setup():
+
+    user = User("test_user", has_sudo=True)
+    machine = Machine(user)
+    machine.setup()