Remove state from central argument list

There is an old PR that shows a great use case for having a different
set of states for the server module. Before the other modules start
being in real use, pull this out so that we don't get ourselves into a
pickle.

lib/ansible/module_utils/openstack.py

@@ -77,7 +77,6 @@ def openstack_full_argument_spec(**kwargs):
         auth=dict(default=None),
         region_name=dict(default=None),
         availability_zone=dict(default=None),
-        state=dict(default='present', choices=['absent', 'present']),
         wait=dict(default=True, type='bool'),
         timeout=dict(default=180, type='int'),
         endpoint_type=dict(

lib/ansible/utils/module_docs_fragments/openstack.py

@@ -53,11 +53,6 @@ options:
     description:
       - Name of the availability zone.
     required: false
-  state:
-    description:
-      - Should the resource be present or absent.
-    choices: [present, absent]
-    default: present
   wait:
     description:
       - Should ansible wait until the requested resource is complete.

v2/ansible/module_utils/openstack.py

@@ -77,7 +77,6 @@ def openstack_full_argument_spec(**kwargs):
         auth=dict(default=None),
         region_name=dict(default=None),
         availability_zone=dict(default=None),
-        state=dict(default='present', choices=['absent', 'present']),
         wait=dict(default=True, type='bool'),
         timeout=dict(default=180, type='int'),
         endpoint_type=dict(