fix hasSubordinate filtering; now it can be safely turned on

servers/slapd/back-bdb/external.h

servers/slapd/back-bdb/init.c

servers/slapd/back-bdb/lcup.c

servers/slapd/back-bdb/operational.c

servers/slapd/back-bdb/search.c

servers/slapd/back-ldbm/external.h

servers/slapd/back-ldbm/init.c

servers/slapd/back-ldbm/operational.c

servers/slapd/back-ldbm/search.c

servers/slapd/back-sql/search.c

servers/slapd/filterentry.c

servers/slapd/proto-slap.h

servers/slapd/slap.h