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

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