add deadline when writing RPC header
add deadline when writing RPC header

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