add real endpoints validity checks
add real endpoints validity checks

Signed-off-by: Jean-Tiare LE BIGOT <d23490937036a737ea9335b34ae9364b6da310b9@ovh.net>

arnaudmorin/python-ovh,arnaudmorin/python-ovh,VincentCasse/python-ovh,bewiwi/python-ovh,NicolasLM/python-ovh