testing: fix address sorting test on macos by removing a fragile assumption (#29820)
testing: fix address sorting test on macos by removing a fragile assumption (#29820)

* Fix address sorting test: remove a fragile assumption
ejona86/grpc,ejona86/grpc,jtattermusch/grpc,ejona86/grpc,stanley-cheung/grpc,grpc/grpc,ctiller/grpc,stanley-cheung/grpc,ctiller/grpc,stanley-cheung/grpc,grpc/grpc,jtattermusch/grpc,grpc/grpc,ejona86/grpc,ctiller/grpc,jtattermusch/grpc,jtattermusch/grpc,stanley-cheung/grpc,jtattermusch/grpc,jtattermusch/grpc,ejona86/grpc,grpc/grpc,ejona86/grpc,ejona86/grpc,ctiller/grpc,stanley-cheung/grpc,jtattermusch/grpc,ctiller/grpc,jtattermusch/grpc,grpc/grpc,stanley-cheung/grpc,ejona86/grpc,stanley-cheung/grpc,grpc/grpc,ejona86/grpc,stanley-cheung/grpc,ctiller/grpc,ctiller/grpc,grpc/grpc,stanley-cheung/grpc,ctiller/grpc,grpc/grpc,grpc/grpc,ctiller/grpc,ejona86/grpc,stanley-cheung/grpc,ctiller/grpc,jtattermusch/grpc,ctiller/grpc,grpc/grpc,jtattermusch/grpc,grpc/grpc,jtattermusch/grpc,stanley-cheung/grpc,grpc/grpc,stanley-cheung/grpc,ejona86/grpc,ctiller/grpc,jtattermusch/grpc,ejona86/grpc