Removes nova_ os_ novaclient_ prefix from string.

def rm_prefix(name):
    """
    Removes nova_ os_ novaclient_ prefix from string.
    """
    if name.startswith('nova_'):
        return name[5:]
    elif name.startswith('novaclient_'):
        return name[11:]
    elif name.startswith('os_'):
        return name[3:]
    else:
        return name