Update to upstream version '0.7.1'
with Debian dir 7e580ad70508156c42e6cc2a3b98a9d95aee1a5a

that returns a value suitable for unicity constraints.

Motivation:

* this is somewhat more of a model concern than a journal/kafka
  concern IMO
* this is one step toward adding support for non-model objects in
  KafkaJournalWriter

Implementation of the unique_key methods comes from
`swh.journal.serializers.object_key`.

Update to upstream version '0.7.0'
with Debian dir 61c3aaf791f4b23b6e9369720b4f00ecc2ba94b6

I created one in the wrong directory and didn't see the existing one.

Update to upstream version '0.6.7'
with Debian dir ff33196235173497970db1401a7c8d6ad3f8d9ce

The addition of '-p no:pytest_swh_core' in pytest.ini is needed to
prevent pytest from loading the pytest_swh_core plugin which we do not
need here and which would require some more dependencies (e.g.
requests).

Use the new SWHID naming convention instead of SWH PID.

Related to T2610

Related to T2610

flake8 hook has been removed from https://github.com/pre-commit/pre-commit-hooks
so now use the one from https://gitlab.com/pycqa/flake8

move most import statements in functions.

Related to T2575.

pytest wastes a lot of time in .hypothesis and .git; this commit excludes them.

We may unknowingly pass naive datetimes to the storage through them,
causing the underlying DB to assign them a timezone that might not match
the actual one.

It already happens in swh.model and swh.loader.package tests.

Update to upstream version '0.6.6'
with Debian dir eb61da2c1a41951fa2201d289612aa6ab413e0b7

Same as for the field data, it helps for code not yet migrated to use model
object.

Related to T645

Update to upstream version '0.6.5'
with Debian dir 7a1ae68e371a5cff48050d2150975ec4179fbefd

Update to upstream version '0.6.4'
with Debian dir 3feb45a7955c550be2cc804911831b4a7428b182

Related to T2105

Related to T2105

Related to T2105

Related to T2105