better field and struct names + set default appropriately

Storage miners, by default, should be configured to accept storage deals.

node/config/def.go

@@ -27,11 +27,11 @@ type FullNode struct {
 type StorageMiner struct {
 	Common
 
-	StorageDeals StorageDealConfig
-	Storage      sectorstorage.SealerConfig
+	Dealmaking DealmakingConfig
+	Storage    sectorstorage.SealerConfig
 }
 
-type StorageDealConfig struct {
+type DealmakingConfig struct {
 	IsAcceptingStorageDeals bool
 }
 
@@ -114,6 +114,10 @@ func DefaultStorageMiner() *StorageMiner {
 			AllowCommit:     true,
 			AllowUnseal:     true,
 		},
+
+		Dealmaking: DealmakingConfig{
+			IsAcceptingStorageDeals: true,
+		},
 	}
 	cfg.Common.API.ListenAddress = "/ip4/127.0.0.1/tcp/2345/http"
 	cfg.Common.API.RemoteListenAddress = "127.0.0.1:2345"

node/modules/storageminer.go

@@ -389,6 +389,6 @@ func NewIsAcceptingStorageDealsFunc(r repo.LockedRepo) (dtypes.IsAcceptingStorag
 			return false, xerrors.New("expected address of config.StorageMiner")
 		}
 
-		return cfg.StorageDeals.IsAcceptingStorageDeals, nil
+		return cfg.Dealmaking.IsAcceptingStorageDeals, nil
 	}, nil
 }