Support multiple log level specifications in the swh cli

This allows users to pass multiple --log-level values to the swh cli, to allow finer grained configuration of the logging of some modules, without having to resort to a full-fledged, very verbose log config file.

Close #2819 (closed).

Test Plan

tox tests added

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Migrated from D4627 (view on Phabricator)

Some references in the commit message have been migrated:

• T2819 is now #2819 (closed)

Build is green

Patch application report for D4627 (id=16420)

Could not rebase; Attempt merge onto 6f9779f4...

Updating 6f9779f..68a35f8
Fast-forward
 swh/core/cli/__init__.py      |  70 +++++++++++++++++++++++----
 swh/core/db/tests/test_cli.py |  63 ++++++++++--------------
 swh/core/tests/test_cli.py    | 109 +++++++++++++++++++++++++++++++++---------
 3 files changed, 170 insertions(+), 72 deletions(-)

Changes applied before test

commit 68a35f8a7375dc1c261ac270bf95637417e4cbcd
Author: Nicolas Dandrimont <nicolas@dandrimont.eu>
Date:   Fri Nov 27 17:33:50 2020 +0100

    Support multiple log level specifications in the swh cli
    
    This allows users to pass multiple --log-level values to the swh cli, to allow
    finer grained configuration of the logging of some modules, without having to
    resort to a full-fledged, very verbose log config file.
    
    Close #2819.

commit 4be641cb96af2f29b073f4199c206230709d6beb
Author: Nicolas Dandrimont <nicolas@dandrimont.eu>
Date:   Fri Nov 27 15:16:30 2020 +0100

    Make command-line tests a bit more resilient
    
    We now match the command line output per section, in a fuzzier way than before.

See https://jenkins.softwareheritage.org/job/DCORE/job/tests-on-diff/171/ for more details.

LGTM. I was wondering if a regexp would not be simpler for the validation step, but it would make error message more generic and less user friendly.

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