Implement proper provisioning for gvaldap

- merge improvements from the internal saltstack repository
- define dummy secrets in the pillars
- use systemd to setup the gvaldap celery worker

states/python/pipenv.sls

@@ -0,0 +1,14 @@
+pipenv-preconditions:
+  pkg.installed:
+    - pkgs:
+      - python3-wheel
+      - python3-pip
+      - python3-setuptools
+
+install_pipenv:
+  cmd.run:
+    - name: python3 -m pip install -U --prefix /usr/local pipenv
+    - creates: /usr/local/bin/pipenv
+    - require:
+      - pipenv-preconditions
+

states/python/virtualenv.sls

@@ -0,0 +1,5 @@
+python3-virtualenv-packages:
+  pkg.installed:
+    - pkgs:
+      - python3-dev
+      - python3-virtualenv