make [init+all]
        shortcut for 'make init all'
make init
        create util subdirs needed by this tool
make all
        initialize the whole topology on all nodes
make showslice
        show SLICE as defined in conf.mk
make shownodes
make showhostnames
make showips
make showlinks
        show nodes and links declared in conf.mk in various formats
make sshchecks
make ovsversions
        try out ssh connectivity to slivers in the slice, or show installed ovs version
make dbs
        initialize ovs db in all slivers
make switchs
        start ovs switch in all slivers
make start 
        shortcut for make dbs switchs
make stop
        stop all ovs switch in all slivers
make status
        list status of db and switch processes in all slivers
make bridges
        create a bridge interface linked to tap devce in each sliver
====================
make showcontrollers
	show how OF controllers are configured from conf.mk
	use CONTROLLER_<nodeid> if set, or CONTROLLER as a default otherwise
make controllers
	configure the various switches so they use the configured controllers

====================
make update (devel)
	push a new version of sliver-ovs into the slivers
	use SLIVER_OVS that should point to the local new version