Activate the support for options from environment variables for swh-scheduler tool

so that one can type (typically in a venv, with services running in dockers):

(venv) swh-environment$ export SWH_SCHEDULER_URL=http://127.0.0.1:5008 (venv) swh-environment$ swh-scheduler task-type list

depends on !62 (closed)

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Migrated from D1044 (view on Phabricator)

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Merge request was merged

closed