vmss list_instance_connection_info should be list-instance-connection-info

[devigned]

This command should not be named with underscores and should probably be changed before GA of the module.

/cc @twitchax @johanste

[devigned]

also, the help file has this as a group, not a command:

$ az vmss list_instance_connection_info -h

Group
    az vmss list_instance_connection_info: Get the IP address and port number used to connect to
    individual instances.

'CommandHelpFile' object has no attribute 'children'
Traceback (most recent call last):
  File "/Users/david/code/azure/azure-cli/src/azure-cli/azure/cli/main.py", line 37, in main
    cmd_result = APPLICATION.execute(args)
  File "/Users/david/code/azure/azure-cli/src/azure-cli-core/azure/cli/core/application.py", line 129, in execute
    args = self.parser.parse_args(argv)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1726, in parse_args
    args, argv = self.parse_known_args(args, namespace)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1758, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1946, in _parse_known_args
    positionals_end_index = consume_positionals(start_index)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1923, in consume_positionals
    take_action(action, args)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1832, in take_action
    action(self, namespace, argument_values, option_string)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1129, in __call__
    subnamespace, arg_strings = parser.parse_known_args(arg_strings, None)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1758, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1946, in _parse_known_args
    positionals_end_index = consume_positionals(start_index)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1923, in consume_positionals
    take_action(action, args)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1832, in take_action
    action(self, namespace, argument_values, option_string)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1129, in __call__
    subnamespace, arg_strings = parser.parse_known_args(arg_strings, None)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1758, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1964, in _parse_known_args
    start_index = consume_optional(start_index)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1904, in consume_optional
    take_action(action, args, option_string)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1832, in take_action
    action(self, namespace, argument_values, option_string)
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 1016, in __call__
    parser.print_help()
  File "/Users/david/.pyenv/versions/3.5.3/lib/python3.5/argparse.py", line 2358, in print_help
    self._print_message(self.format_help(), file)
  File "/Users/david/code/azure/azure-cli/src/azure-cli-core/azure/cli/core/parser.py", line 167, in format_help
    is_group)
  File "/Users/david/code/azure/azure-cli/src/azure-cli-core/azure/cli/core/_help.py", line 52, in show_help
    print_detailed_help(help_file)
  File "/Users/david/code/azure/azure-cli/src/azure-cli-core/azure/cli/core/_help.py", line 81, in print_detailed_help
    _print_groups(help_file)
  File "/Users/david/code/azure/azure-cli/src/azure-cli-core/azure/cli/core/_help.py", line 210, in _print_groups
    if len(help_file.children) > 0 \
AttributeError: 'CommandHelpFile' object has no attribute 'children'