[rrdtool-maint] rrdtool: Move from alioth- to tracker.d.o.

[Jean-Michel Vourgère]

Hello Alexander

Just to let you known, I'm moving the rrdtool maintainer team list from 
deprecated alioth to the new tracker.debian.org system. 

https://lists.debian.org/debian-devel-announce/2018/07/msg00001.html

https://tracker.debian.org/teams/rrdtool/

https://salsa.debian.org/rrdtool-team/rrdtool/commit/
4fffb90f47159507b93d71177f08d52e482cc985