Disable every-block full state validation

We can re-enable it on some nodes to keep an eye on the network,
but for debug builds this is too expensive. It can take over 60
sec for low-end environments, causing them to never catch up.

I think this is still better than the alternative of telling
everyone to run release builds.

grin.toml

@@ -46,7 +46,7 @@ chain_type = "Testnet2"
 #want to run a full chain validation. Can be:
 #EveryBlock - run full chain validation when processing each block (except during sync)
 #Disabled - disable full chain validation (just run regular block validation)
-#chain_validation_mode=EveryBlock
+#chain_validation_mode=Disabled
 
 #run the node in "full archive" mode (default is fast-sync, pruned node)
 #archive_mode = false

grin/src/types.rs

@@ -98,7 +98,7 @@ pub enum ChainValidationMode {
 
 impl Default for ChainValidationMode {
 	fn default() -> ChainValidationMode {
-		ChainValidationMode::EveryBlock
+		ChainValidationMode::Disabled
 	}
 }