Make a template that demonstrates instance monitoring and restarting.

Make a template that demonstrates instance monitoring and restarting.

We use cfn-push-stats to send a heartbeat and if we don't get
it within the set interval we restart the instance.

Other changes to make this work:
- clear the waitcondition when it is deleted.
- set the resource id to None when deleted, else it won't re-create
  properly.
- don't run watch alarms if the stack is not completed.

Change-Id: I5dfc8b372f557cf43379c6c5b7436d1010f83e3c
Signed-off-by: Angus Salkeld <asalkeld@redhat.com>