OpenID has continued to be available for lava-server on jessie as long as lava-server stayed on django1.7 but the OpenID django support does not operate with django later than 1.7. To continue with upstream django security and bug fix support, lava-server needs to move to requiring django1.8 which means that OpenID can no longer be supported in jessie. Support for OpenID in unstable and testing was removed when django1.8 support first arrived.
Once lava-server 2016.7 arrives in jessie-backports, it will conflict with the python-django-auth-openid package - this means that to install the 2016.7 upgrade from jessie-backports, apt will first cause the removal of python-django-auth-openid. (Allowing python-django-auth-openid to remain on the system will corrupt subsequent django operations, causing the package installation to fail during the database migrations.)
OpenID support in lava-server is also due to be removed for 2016.7, so the documentation and settings will no longer reference OpenID.
LDAP support, Debian SSO and local django accounts will remain available.
https://packages.debian.org/stable/python-django-auth-openid https://wiki.debian.org/DebianSingleSignOn