Remove useless -O option to "float run"

The same result can be achieved by simply setting the
ANSIBLE_STDOUT_CALLBACK env var, as one would with ansible-playbook.

float

@@ -416,16 +416,12 @@ def command_run(config, playbooks,
                 ansible_verbosity=0,
                 ansible_check=False,
                 ansible_diff=False,
-                ansible_stdout=None,
                 ansible_limit=None,
                 ansible_extra_vars=[]):
     if not os.path.exists(config):
         raise Exception(
             'The configuration file %s does not exist!' % (config,))
 
-    if ansible_stdout:
-        os.environ['ANSIBLE_STDOUT_CALLBACK'] = ansible_stdout
-
     for arg in playbooks:
         if not os.path.exists(arg):
             # See if we have a stock playbook with that name.
@@ -583,10 +579,6 @@ memberships, using the --additional-host-group command-line option.
     run_parser.add_argument(
         '-C', '--check', dest='ansible_check', action='store_true',
         help='Run ansible-playbook with the --check flag')
-    run_parser.add_argument(
-        '-O', '--stdout', dest='ansible_stdout', type=str,
-        help='Select ansible stdout callback (e.g. minimal, actionable)',
-        default=None)
     run_parser.add_argument(
         '-D', '--diff', dest='ansible_diff', action='store_true',
         help='Run ansible-playbook with the --diff flag')