[test] remove no more necessary attribute cache manipulation to repair test

[entity] more tweaks for entity attribute cache handling on cw_set/cw_create to fix test regression * when an attribute is listed in dont-cache-attrs, purge any previous value * test value is actually modified in EditedEntity.__setitem__ before adding attribute to dont-cache-attrs

[entity/hooks] fix regression introduced by 4ba11607d84a on create_entity, attributes weren't cached, but they are since 4ba11607d84a and this triggered a bug: used values may be transformed by hooks (e.g. TidyHtmlFields), ending in invalid value in the cache. This is the regression. Now, set_attributes used to update the attributes cache while suffering from the very same pb. This is the now fixed old bug. Transformed attributes are now recorded in a transaction shared variable, and those are omitted from the client cache.

[doc] use :meth: and remove doc to deprecated methods

[doc] add passlib to list of dependencies

Added tag cubicweb-debian-version-3.15.2-1 for changeset 9aa5553b2652

Added tag cubicweb-version-3.15.2 for changeset 2afc157ea9b2

[test] missing future import

[web test] fix tests broken by 8de41063d629

3.15.2

[web login] fix after login redirection: redirect expect an url not a relative path. Breaks on cases like '?vid=aview'. Closes #2423575

[config] load_configuration should not crash because of fs errors. Closes #2286215

[entity api] unify set_attributes / set_relations into a cw_set method. Closes #2423719 Allowing similar usage as create_entity/cw_instantiate. Update cw code base to remove deprecated calls.

[workflow ui] fix state/transition edition form on existing entity. Closes #2423531 It should not return unrelated entities only in case where the entity exists. Also fix a deprecation warning, vocabulary values should be an unicode string.

[predicates] fix predicates that erroneously evaluate the entity passed as a parameter as a boolean, instead of testing its existence in the keyword arguments -using the kwargs.get('entity') idiom instead of 'entity' in kwargs or similar- ; closes #2424288