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_getaddr_caching.py

@@ -12,7 +12,7 @@ from test_framework.messages import (
     msg_addr,
     msg_getaddr,
 )
-from test_framework.mininode import (
+from test_framework.p2p import (
     P2PInterface,
     p2p_lock
 )