This change removes the legacy libnssdbm database that we migrated away from since Firefox 60.

This change modifies all tests that use key3/cert8 to use the new files. It
removes test_sdr_upgraded_with_password, as without the upgrade part that is now
the same test as test_sdr_preexisting_with_password. It otherwise removes support for libnssdbm everywhere in Gecko.

Differential Revision: https://phabricator.services.mozilla.com/D55708

--HG--
rename : security/manager/ssl/tests/unit/test_sdr_preexisting/key4.db => security/manager/ssl/tests/unit/test_broken_fips/key4.db
extra : moz-landing-system : lando