Improved Primitive support and better testing

This changeset addresses several issues.

- Improve primitive support so the status and output of an executed
primitive can be retrieved
- Merge latest upstream libjuju (required for new primive features)
- New testing framework
    This is the start of a new testing framework with the ability to
create and configure LXD containers with SSH, to use while testing proxy
charms.
- Add support for using ssh keys with proxy charms
    See Feature 1429. This uses the per-proxy charm/unit ssh keypair

Signed-off-by: Adam Israel <adam.israel@canonical.com>
diff --git a/modules/libjuju/tests/integration/test_controller.py b/modules/libjuju/tests/integration/test_controller.py
index 9c6f7ac..93e2883 100644
--- a/modules/libjuju/tests/integration/test_controller.py
+++ b/modules/libjuju/tests/integration/test_controller.py
@@ -1,8 +1,10 @@
 import asyncio
-import pytest
+import subprocess
 import uuid
 
 from juju.client.connection import Connection
+from juju.client.jujudata import FileJujuData
+from juju.controller import Controller
 from juju.errors import JujuAPIError
 
 import pytest
@@ -168,3 +170,31 @@
         await asyncio.wait_for(_wait_for_model_gone(controller,
                                                     model_name),
                                timeout=60)
+
+
+# this test must be run serially because it modifies the login password
+@pytest.mark.serial
+@base.bootstrapped
+@pytest.mark.asyncio
+async def test_macaroon_auth(event_loop):
+    jujudata = FileJujuData()
+    account = jujudata.accounts()[jujudata.current_controller()]
+    with base.patch_file('~/.local/share/juju/accounts.yaml'):
+        if 'password' in account:
+            # force macaroon auth by "changing" password to current password
+            result = subprocess.run(
+                ['juju', 'change-user-password'],
+                input='{0}\n{0}\n'.format(account['password']),
+                universal_newlines=True,
+                stderr=subprocess.PIPE)
+            assert result.returncode == 0, ('Failed to change password: '
+                                            '{}'.format(result.stderr))
+        controller = Controller()
+        try:
+            await controller.connect()
+            assert controller.is_connected()
+        finally:
+            if controller.is_connected():
+                await controller.disconnect()
+        async with base.CleanModel():
+            pass  # create and login to model works