add missing TODO to network_test.go
add missing TODO to network_test.go

NebulousLabs/Sia,mharkus/Sia,mharkus/Sia,ChrisSchinnerl/Sia,MrStrong/Sia,NebulousLabs/Sia,mtlynch/Sia,ericflo/Sia,ChrisSchinnerl/Sia,ericflo/Sia,MrStrong/Sia,mtlynch/Sia