Revert "Remove vendored libjuju"

This reverts commit 9d18c22a0dc9e295adda50601fc5e2f45d2c9b8a.

Change-Id: I7dbf291ccd750c5f836ff80c642be492434ab3ac
Signed-off-by: Adam Israel <adam.israel@canonical.com>
diff --git a/modules/libjuju/tests/integration/test_client.py b/modules/libjuju/tests/integration/test_client.py
new file mode 100644
index 0000000..240c471
--- /dev/null
+++ b/modules/libjuju/tests/integration/test_client.py
@@ -0,0 +1,21 @@
+from juju.client import client
+
+import pytest
+
+from .. import base
+
+
+@base.bootstrapped
+@pytest.mark.asyncio
+async def test_user_info(event_loop):
+    async with base.CleanModel() as model:
+        controller_conn = await model.connection().controller()
+
+        um = client.UserManagerFacade.from_connection(controller_conn)
+        result = await um.UserInfo(
+            [client.Entity('user-admin')], True)
+        await controller_conn.close()
+
+        assert isinstance(result, client.UserInfoResults)
+        for r in result.results:
+            assert isinstance(r, client.UserInfoResult)