Fix dangerous elb_application_lb state (#44646)

* elb_application_lb: fix dangerous default of deleting an ELB if state is omitted by changing state to default to present to be more like other AWS modules

changelogs/fragments/elb_application_lb_fix_state_default.yml

@@ -0,0 +1,4 @@
+---
+bugfixes:
+- elb_application_lb - Fix a dangerous behavior of deleting an ELB if state was omitted from the task.
+  Now state defaults to 'present', which is typical throughout AWS modules.

lib/ansible/modules/cloud/amazon/elb_application_lb.py

@@ -102,7 +102,7 @@ options:
   state:
     description:
       - Create or destroy the load balancer.
-    required: true
+    default: present
     choices: [ 'present', 'absent' ]
   tags:
     description:
@@ -528,7 +528,7 @@ def main():
             subnets=dict(type='list'),
             security_groups=dict(type='list'),
             scheme=dict(default='internet-facing', choices=['internet-facing', 'internal']),
-            state=dict(choices=['present', 'absent'], type='str'),
+            state=dict(choices=['present', 'absent'], default='present'),
             tags=dict(type='dict'),
             wait_timeout=dict(type='int'),
             wait=dict(default=False, type='bool'),