[massive store] Store entities in temporary table as well * on some entity type is encountered by a slave, create a dedicated table for insertion of entities of this type by this slave, similarly to what is done for relation - this should lower changes of conflicts in master/slaves mode ; * delay drop of constraints and indexes to `finish` method, where copy from temporary tables to regular table is done ; * insertion of metadata is done by scanning temporary tables, which may be way shorter than theier associated regular table ; * drop drop_metadata_constraints with its constraint_dropped friend attribute, there are no more necessary since this is done once in the `finish`. Related to #15538303

[tox]
envlist = py27,py34,flake8

[testenv]
sitepackages = true
deps =
  pytest
commands =
  {envpython} -m pytest {posargs:test}

[testenv:flake8]
skip_install = true
whitelist_externals =
  flake8
deps =
  flake8
commands = flake8

[flake8]
exclude = cubicweb_%(cubename)s/migration/*,test/data/*,.tox/*