scripted-diff: use self.sync_* methods

-BEGIN VERIFY SCRIPT-
sed -i -e 's/sync_blocks(self.nodes)/self.sync_blocks()/g'     $(git grep -l 'sync_blocks(self.nodes)'   ./test/functional/*.py)
sed -i -e 's/sync_mempools(self.nodes)/self.sync_mempools()/g' $(git grep -l 'sync_mempools(self.nodes)' ./test/functional/*.py)

sed -i -e 's/  sync_blocks(/  self.sync_blocks(/g'     $(git grep -l sync_blocks   ./test/functional/*.py)
sed -i -e 's/  sync_mempools(/  self.sync_mempools(/g' $(git grep -l sync_mempools ./test/functional/*.py)
-END VERIFY SCRIPT-

test/functional/mempool_packages.py

@@ -163,7 +163,7 @@ class MempoolPackagesTest(BitcoinTestFramework):
         # Check that prioritising a tx before it's added to the mempool works
         # First clear the mempool by mining a block.
         self.nodes[0].generate(1)
-        sync_blocks(self.nodes)
+        self.sync_blocks()
         assert_equal(len(self.nodes[0].getrawmempool()), 0)
         # Prioritise a transaction that has been mined, then add it back to the
         # mempool by using invalidateblock.
@@ -228,7 +228,7 @@ class MempoolPackagesTest(BitcoinTestFramework):
         # Test reorg handling
         # First, the basics:
         self.nodes[0].generate(1)
-        sync_blocks(self.nodes)
+        self.sync_blocks()
         self.nodes[1].invalidateblock(self.nodes[0].getbestblockhash())
         self.nodes[1].reconsiderblock(self.nodes[0].getbestblockhash())
 
@@ -283,12 +283,12 @@ class MempoolPackagesTest(BitcoinTestFramework):
         rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
         signedtx = self.nodes[0].signrawtransactionwithwallet(rawtx)
         txid = self.nodes[0].sendrawtransaction(signedtx['hex'])
-        sync_mempools(self.nodes)
+        self.sync_mempools()
 
         # Now try to disconnect the tip on each node...
         self.nodes[1].invalidateblock(self.nodes[1].getbestblockhash())
         self.nodes[0].invalidateblock(self.nodes[0].getbestblockhash())
-        sync_blocks(self.nodes)
+        self.sync_blocks()
 
 if __name__ == '__main__':
     MempoolPackagesTest().main()