cubicweb-mercurial-server #2515057 Review and refactor the way we write access.conf [validation pending]

The way we write access.conf is complex and probably linked to a hook/operation organisation which need improvements. We now want to generate the access.conf file anew each time.

prioritynormal
typetask
done in0.2.0
load2.000
load left0.000
closed by<not specified>