add dnsjava dependency to helios-tools
add dnsjava dependency to helios-tools

It is not exactly inherited as a transitive dependency any more from
helios-client with the latter now relocated dnsjava.

mattnworb/helios,spotify/helios,mattnworb/helios,mattnworb/helios,mavenraven/helios,stewnorriss/helios,stewnorriss/helios,gtonic/helios,spotify/helios,gtonic/helios,stewnorriss/helios,mavenraven/helios,mavenraven/helios,gtonic/helios,spotify/helios