Include the Tower venv in the isolated bubblewrapped arguments.

This moves the container-based code location and venvs.
The goal here is that the paths of Tower source for isolated
vs normal nodes matches (both in prod and local development) so that we
don't have to add a bunch of additional bwrap argument logic for
<location-of-isolated-tower-venv>.

tools/docker-isolated-override.yml

@@ -11,7 +11,7 @@ services:
     image: gcr.io/ansible-tower-engineering/tower_isolated:${TAG}
     hostname: isolated
     volumes:
-      - "../awx/main/isolated:/tower_isolated"
+      - "../awx/main/isolated:/tower_devel"
       - "../awx/lib:/tower_lib"
       - "/sys/fs/cgroup:/sys/fs/cgroup:ro"
     privileged: true

tools/docker-isolated/tower-expect

@@ -1,3 +1,3 @@
 #!/bin/bash
-. /venv/tower_isolated/bin/activate
-exec env TOWER_LIB_DIRECTORY=/tower_lib /tower_isolated/run.py "$@"
+. /venv/tower/bin/activate
+exec env TOWER_LIB_DIRECTORY=/tower_lib /tower_devel/run.py "$@"