bugfix: schemas/pg_hba.conf: don't allow ident authentication for Unix socket connections, because this apparently prevents having normal, password-based connections ("md5"). note that just switching the order of the ident and md5 entries is not useful, because whichever authentication type comes second will be ignored completely. this problem was previously worked around by just not using Unix socket connections at all, and always specifying "localhost" as the host to force a hostname-based connection. this does not affect the postgres superuser, because they have their own ident line in pg_hba.conf.