Fix typo in sbin/usrcmd/get_fqn which could prevent full fqn to be computed.

(cherry picked from commit 3fe9f7c18eebd9833fa9a3ce36ec2374a1765a21)
Reference Apache Httpd class used for group filtering.

(cherry picked from commit 7e29a32a721c0a55871d817d76c4c87b23471282)
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).

(cherry picked from commit c1aa49bf8f76d82cca727270ad1b60992d94d23a)