This allows changing the separator for the `OAUTH_ALLOWED_ROLES` and
`OAUTH_ADMIN_ROLES` env vars, from the default comma (,) to something
that is not present in the role name. The intended audience is folks
with LDAP-syntax groups/roles, e.g.
`cn=webui_admin,ou=it_department,o=my_org` instead of just
`webui_admin`.
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