Rebuild for sync layer-openstack

Also explicitly set ``include_system_packages`` to False.

While that setting is now the a default we consume from
``layer-basic`` it is more clear for the causual reader
of the charm source code.

Remove redundant entries from ``wheelhouse.txt``.

Change-Id: Ib1c2f5b7f8051c9dc9f1da9f320810741d0cf637

rebuild

@@ -2,4 +2,4 @@
 # when dependencies of the charm change,
 # but nothing in the charm needs to.
 # simply change the uuid to something new
-adfc2315-f9f7-4015-a611-d8a7c981e3cb
+f57f307b-74f9-4f1d-bdc2-50e20aecbb63

src/layer.yaml

@@ -1,4 +1,8 @@
 includes:
   - layer:openstack
   - interface:manila-plugin
+options:
+  basic:
+    use_venv: True
+    include_system_packages: False
 repo: https://github.com/openstack/charm-manila-generic

src/wheelhouse.txt

@@ -1,3 +0,0 @@
-
-jinja2
-psutil