clarify repair goroutine
clarify repair goroutine

eventually we may want to split this into a separate function,
although managing the concurrency is tricky.

rivine/rivine,mnsl/Sia,rivine/rivine,MrStrong/Sia,NebulousLabs/Sia,mtlynch/Sia,ericflo/Sia,ChrisSchinnerl/Sia,mtlynch/Sia,MrStrong/Sia,ericflo/Sia,mharkus/Sia,Mingling94/Sia,NebulousLabs/Sia,mharkus/Sia,mnsl/Sia,ChrisSchinnerl/Sia,johnathanhowell/Sia