scripted-diff: Rename mininode to p2p

-BEGIN VERIFY SCRIPT-
sed -i 's/\.mininode/\.p2p/g' $(git grep -l "mininode")
git mv test/functional/test_framework/mininode.py test/functional/test_framework/p2p.py
-END VERIFY SCRIPT-

test/functional/p2p_blocksonly.py

@@ -5,7 +5,7 @@
 """Test p2p blocksonly"""
 
 from test_framework.messages import msg_tx, CTransaction, FromHex
-from test_framework.mininode import P2PInterface
+from test_framework.p2p import P2PInterface
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal