opentsdb: New package and NixOS module

nixos/modules/misc/ids.nix

@@ -166,6 +166,7 @@
       etcd = 156;
       docker-registry = 157;
       hbase = 158;
+      opentsdb = 159;
 
       # When adding a uid, make sure it doesn't match an existing gid. And don't use uids above 399!
 
@@ -286,6 +287,7 @@
       riemann = 137;
       riemanndash = 138;
       hbase = 139;
+      opentsdb = 140;
       uhub = 142;
       mailpile = 146;
       redmine = 147;