Update check-update-from option according to RFC 7950 section 11
Update check-update-from option according to RFC 7950 section 11

    Max elements statement can be removed

    Prefix change with base statements
    caused the error. This is fixed

    If-feature can be removed if note is
    not mandatory

    Base statement can be added to identity

    Base statement can be removed from identityref

    Config change to true only if mandatory had
    not existing variable

Signed-off-by: miroslav.kovac <852986285a8a1a17265f91aabc70953618a2bc86@pantheon.tech>

mbj4668/pyang,mbj4668/pyang