[dataimport] drop massive store's flush_metadata method
This method handle a temporary table which sounds useless, and even buggy in
some cases (metadata for a single entity types will be only flushed once even if
flush is called several time). Instead, simply call the method-doing-the job
after entities have been inserted (and make it private along the way).
^build$
^dist$
\.egg-info$
^.tox$
^.cache$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data.*/database/.*
.*/data/ldapdb/.*
.*/data/uicache/
.*/data/cubes/.*/i18n/.*\.po
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
^doc/_build
^doc/js_api/