Rename 10-swh-init.sql as 10-superuser-init.sql
so the db initialization from swh.core (>= 0.3) executes this during the database creation step (i.e. while having a superuser level connection to the database).
Also drop the -swh- part of sql files, it does not bring any meaningful info and makes it somewhat inconsistent with the new -superuser- "tag".
Migrated from D4001 (view on Phabricator)