[devtools] properly close open access on tearDown avoiding further warning about living sessions while the repo is turned off. The doc string says: The RepoAccess need to be closed to destroy the associated Session. TestCase usually take care of this aspect for the user. but that wasn't true until now.

[devtools] make comment (a bit) more readable

[devtools] avoid an internal deprecation warning websession and session are now one and the same.

[server/session] undeprecate session.anonymous_session It's not connection-specific.

[web/sessions] use session.sessionid instead of deprecated session.id

[repo] don't set cnxset when getting the session to close it and avoid warning about that. session._cnx.rollback won't do anything if it's not set and a newer connection is now created to run the session_close hook, so there is not need to set cnxset. Notice we have to take care about not trying to rollback the underlying cnx when the session is not 'session_handled' (i.e. bw compat mode). This case only occurs due to hackish things to keep bw compat in testlib.

[repo] handle connection explicitly when calling session open/close hooks

[hooks/syncschema] work with connections not sessions

[server/sources] {before,after}_entity_insertion wants a cnx not a session

[hooks/syncsources] use a cnx not a session