add --list-modules in the usage()
add --list-modules in the usage()

biddyweb/flexisip,gale320/flexisip,gale320/flexisip,BelledonneCommunications/flexisip,biddyweb/flexisip,gale320/flexisip,BelledonneCommunications/flexisip,BelledonneCommunications/flexisip,gale320/flexisip,biddyweb/flexisip,BelledonneCommunications/flexisip,biddyweb/flexisip