remove vreg argument to CWPublisher The passing a vreg to CWPublisher was used by test to allow reused of an existing vreg. We dropped this feature two commit ago and can safely removes it. Removing this argument allows later cleanup and improvement on the CWPublisher and Repository front. closes #2944813

[devtools] vreg becomes a class ppty After multiple devtools refactoring, the vreg used for test is now *always* got from the repository. Making this explicit is a step toward simplification of the vreg handling during various initialisation phases. Related to #2944813

[devtools] drop unused `reset_schema` and `reset_vreg` class attribute They have no effect and no user... Related to #2944813

[connection] move security control logic on Connection The _security_enabled context manager now operate on connection. We have to keep a specific entry point in Session to ensure Connection object are properly cleaned up when using session to "manage" Connection live cycle. Related to #2503918

[connection] move hook control logic on Connection The _hook_control context manager now operate on connection. We have to keep a specific entry point in Session to ensure Connection object are properly cleaned up when using session to "manage" Connection live cycle. Related to #2503918

[session] update _hook_control docstring

[connection] reinstall cnx.data as cnx.transaction_data Too much code expects self._cw.data to be session data. backout 9b2f68916474 Related to #2503918 Related to #2912807

[connection] give access to is_internal_session boolean Needed if we are to use this object like we currently do with session. Related to #2503918

[req] drop from_controller on non WebRequest object (Closes #2901079) The `controller` concept is purely a web things. It does not belong to generic `req` object. The `build_url` code is slightly changed to handle that. This probably requires extended cleanup later. This is a barely used and very internal API. No deprecation period

[connection] add logging method on connection If we are to use this object like we currently do with session, we need to have the logging method as a lot of code use them.