cli: speedup the `swh` cli command startup time

move most import statements in functions.

Related to swh-environment#2575 (closed).

---

Migrated from D3916 (view on Phabricator)

Some references in the commit message have been migrated:

• T2575 is now swh-environment#2575 (closed)

Build is green

Patch application report for D3916 (id=13775)

Rebasing onto 12fe1f78...

Current branch diff-target is up to date.

Changes applied before test

commit 7404486d0c09da45127c84b7e51eec22aaaac172
Author: David Douard <david.douard@sdfa3.org>
Date:   Wed Sep 9 17:41:47 2020 +0200

    cli: speedup the `swh` cli command startup time
    
    move most import statements in functions.
    
    Related to swh/devel/swh-environment#2575.

See https://jenkins.softwareheritage.org/job/DMOD/job/tests-on-diff/134/ for more details.

Merge request was accepted

approved this merge request

Merge request was merged

closed