Remove dhcpdb.bind file if changed dhcpdb.pool file.

	      If dhcpdb.pool file is changed and dhcpdb.bind file is
	    not matched to new pool file, dhcp server(dhcps) can not
	    run with some errors like this.

	      I fixed start-up script to remove dhcpdb.bind file
	    when dhcpdb.pool file is newer than dhcpdb.bind.


    Install intro.dhcp.jis file into ${PREFIX}/share/dhcp dirctory.