fix a few isolated dev issues

the main goal of this change is to make `make docker-isolated` work out
of the box

- specify the proper version for awx-expect --version
- update some deprecated playbook bits
- change the isolated container to privileged so bwrap will work
- fix awx-manage test_isolated_connection
- expedite the first isolated heartbeat so you don't have to wait 10m;
  this is accomplished by _not_ setting Instance.last_isolated_check to
  now() at insertion time (which causes the next check not to happen for
  10 minutes)
- fix a bug that caused isolated node execution to fail when bwrap was
  enabled

see: https://github.com/ansible/tower/issues/2150

This reverts commit 9863fe71dc.

tools/docker-isolated-override.yml

@@ -14,6 +14,4 @@ services:
       - "../awx/main/expect:/awx_devel"
       - "../awx/lib:/awx_lib"
       - "/sys/fs/cgroup:/sys/fs/cgroup:ro"
-    tmpfs:
-      - "/tmp:exec"
-      - "/run"
+    privileged: true

tools/docker-isolated/Dockerfile

@@ -27,7 +27,4 @@ RUN ssh-keygen -A
 RUN mkdir -p /root/.ssh
 RUN touch /root/.ssh/authorized_keys
 
-STOPSIGNAL SIGRTMIN+3
-
-
 CMD ["/usr/sbin/init"]