functional_tests: reset blockchain on test start

tests/functional_tests/transfer.py

@@ -39,6 +39,7 @@ from framework.wallet import Wallet
 
 class TransferTest():
     def run_test(self):
+        self.reset()
         self.create()
         self.mine()
         self.transfer()
@@ -46,6 +47,12 @@ class TransferTest():
         self.check_double_spend_detection()
         self.sweep_single()
 
+    def reset(self):
+        print 'Resetting blockchain'
+        daemon = Daemon()
+        daemon.pop_blocks(1000)
+        daemon.flush_txpool()
+
     def create(self):
         print 'Creating wallets'
         seeds = [