Add integration test to verify the SendBlocks RPC stalls
Add integration test to verify the SendBlocks RPC stalls

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