data/defaults: Drop global.ini file

This should allow dropping "dead code" in swh.core.config module regarding ini file [1]. This is the remaining sole instance of such file.

• [1] https://forge.softwareheritage.org/source/swh-core/browse/master/swh/core/config.py$96-104

Related to T1532

Test Plan

octocatalog

bin/octocatalog-diff --octocatalog-diff-args --no-truncate-details --to staging uffizi
Found host uffizi.softwareheritage.org
Cloning into '/tmp/swh-ocd.WIAYt237/environments/production/data/private'...
done.
Cloning into '/tmp/swh-ocd.WIAYt237/environments/staging/data/private'...
done.
*** Running octocatalog-diff on host uffizi.softwareheritage.org
I, [2020-09-16T14:27:38.255079 #24752]  INFO -- : Catalogs compiled for uffizi.softwareheritage.org
I, [2020-09-16T14:27:39.467942 #24752]  INFO -- : Diffs computed for uffizi.softwareheritage.org
diff origin/production/uffizi.softwareheritage.org current/uffizi.softwareheritage.org
*******************************************
  File[/etc/softwareheritage/global.ini] =>
   parameters =>
     ensure =>
      - file
      + absent
*******************************************
*** End octocatalog-diff on uffizi.softwareheritage.org

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Migrated from D3963 (view on Phabricator)