Fix typo in sbin/usrcmd/get_fqn which could prevent full fqn to be computed.
Reference Apache Httpd class used for group filtering.
Add group filtering in Apache Httpd, and redirection to /g2it in NGiNX.

Group filtering only work if AuthnProviderAlias isn't used.
That lead to duplication of the gitweb /git access, with group filtering
in one case, and no group filtering for /g2it (used by dummy accounts).