Adapt cli declaration entrypoint to swh.core 0.3

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).

pytest.ini

 [pytest]
-addopts = --doctest-modules
+addopts = --doctest-modules -p no:pytest_swh_core
 norecursedirs = docs .*
 markers =
     fs: tests that involve filesystem ios

requirements-cli.txt

-swh.core
+swh.core >= 0.3
 Click
 dulwich

setup.py

@@ -54,14 +54,14 @@ setup(
     ),
     extras_require={
         "cli": parse_requirements("cli"),
-        "testing": parse_requirements("test"),
+        "testing": parse_requirements("test") + parse_requirements("cli"),
     },
     include_package_data=True,
     entry_points="""
         [console_scripts]
         swh-identify=swh.model.cli:identify
         [swh.cli.subcommands]
-        identify=swh.model.cli:identify
+        identify=swh.model.cli
     """,
     classifiers=[
         "Programming Language :: Python :: 3",

swh/model/cli.py

@@ -9,6 +9,8 @@ import sys
 # WARNING: do not import unnecessary things here to keep cli startup time under
 # control
 import click
+from swh.core.cli import swh as swh_cli_group
+
 
 CONTEXT_SETTINGS = dict(help_option_names=["-h", "--help"])
 
@@ -138,7 +140,7 @@ def identify_object(obj_type, follow_symlinks, obj):
     return (obj, swhid)
 
 
-@click.command(context_settings=CONTEXT_SETTINGS)
+@swh_cli_group.command(context_settings=CONTEXT_SETTINGS)
 @click.option(
     "--dereference/--no-dereference",
     "follow_symlinks",