[qa] blockstore: Switch to dumb dbm

Github-Pull: #8834
Rebased-From: fa9cd25ed0

qa/rpc-tests/test_framework/blockstore.py

@@ -9,11 +9,11 @@
 
 from .mininode import *
 from io import BytesIO
-import dbm.ndbm
+import dbm.dumb as dbmd
 
 class BlockStore(object):
     def __init__(self, datadir):
-        self.blockDB = dbm.ndbm.open(datadir + "/blocks", 'c')
+        self.blockDB = dbmd.open(datadir + "/blocks", 'c')
         self.currentBlock = 0
         self.headers_map = dict()
 
@@ -123,7 +123,7 @@ class BlockStore(object):
 
 class TxStore(object):
     def __init__(self, datadir):
-        self.txDB = dbm.ndbm.open(datadir + "/transactions", 'c')
+        self.txDB = dbmd.open(datadir + "/transactions", 'c')
 
     def close(self):
         self.txDB.close()