[entity,storage] remove hackish code from the bfss path
The ClientConnection/Connection duality brought some painful hacks
that are no longer needed.
Hence we can send entity._cw_update_attr_cache and ._cw_dont_cache_attribute
to the grave.
Related to #3837233
\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/