load_users: keep all user infos from ldap

Keep all user infos fetched from ldap (not only ssh key), so that they
can be used in gitolite configuration.
Call load_users in glconf

Load users from ldap even in glconf, as some infos from users can be
used in gitolite configuration.
soft_repo.gl: use variable for maintainer
soft_repo.gl: set maintainer as gitweb.owner

(idea from Colin)