Normalize to IBM's OPL notice (with permission).

servers/slapd/slapi/Makefile.in

servers/slapd/slapi/ibm_pblock_params.h

servers/slapd/slapi/plugin.c

servers/slapd/slapi/printmsg.c

servers/slapd/slapi/proto-slapi.h

servers/slapd/slapi/slapi.h

servers/slapd/slapi/slapi_ext.c

servers/slapd/slapi/slapi_ops.c

servers/slapd/slapi/slapi_pblock.c

servers/slapd/slapi/slapi_utils.c