Return the ID of the keyname

def get_keyid(keyname):
    '''
    Return the ID of the keyname
    '''
    if not keyname:
        return None
    keypairs = list_keypairs(call='function')
    keyid = keypairs[keyname]['id']
    if keyid:
        return keyid
    raise SaltCloudNotFound('The specified ssh key could not be found.')