List all Launch Configurations.

    CLI example::

        salt myminion boto_asg.list_launch_configurations

def list_launch_configurations(region=None, key=None, keyid=None,
                                profile=None):
    '''
    List all Launch Configurations.

    CLI example::

        salt myminion boto_asg.list_launch_configurations
    '''
    ret = get_all_launch_configurations(region, key, keyid, profile)
    return [r.name for r in ret]