ldap: allow to disable the groups relevance filtering
The LDAP groups are filtered by relevance to the Gerrit ACLs.
However, that optimization has the side effect of blocking users
to access legitimate projects if they are temporarily not cached
Allow to disable the LDAP filtering optimization for having always
a 100% consistent ACL evaluation, regardless of the project's cache
By default, keep the existing behaviour if not configured differently
on the gerrit.config.
Bug: Issue 9781