Sort a list of mentor/mentee relationships.

Approved by:	gnn (mentor)
Differential Revision: https://reviews.freebsd.org/D38658

share/misc/committers-src.dot

@@ -553,18 +553,18 @@ gibbs -> whu
 
 glebius -> mav
 
-gnn -> jinmei
-gnn -> rrs
-gnn -> ivoras
-gnn -> vanhu
-gnn -> lstewart
-gnn -> np
-gnn -> davide
 gnn -> arybchik
+gnn -> davide
 gnn -> erj
-gnn -> kp
+gnn -> ivoras
+gnn -> jinmei
 gnn -> jtl
 gnn -> karels
+gnn -> kp
+gnn -> lstewart
+gnn -> np
+gnn -> rrs
+gnn -> vanhu
 
 gonzo -> jmcneill
 gonzo -> wulf