ITS#2440 unmunge init_module names

servers/slapd/back-bdb/init.c

servers/slapd/back-dnssrv/init.c

servers/slapd/back-ldap/init.c

servers/slapd/back-ldbm/init.c

servers/slapd/back-meta/init.c

servers/slapd/back-monitor/init.c

servers/slapd/back-passwd/init.c

servers/slapd/back-perl/init.c

servers/slapd/back-shell/init.c

servers/slapd/back-sql/init.c

servers/slapd/back-tcl/tcl_init.c