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.

awx/main/models/ha.py

@@ -50,7 +50,6 @@ class Instance(BaseModel):
     last_isolated_check = models.DateTimeField(
         null=True,
         editable=False,
-        auto_now_add=True
     )
     version = models.CharField(max_length=24, blank=True)
     capacity = models.PositiveIntegerField(