[QA] restructure rpc tests directory

* move non-test classes to subdir `test-framework`

qa/rpc-tests/test_framework/blocktools.py

@@ -0,0 +1,65 @@
+# blocktools.py - utilities for manipulating blocks and transactions
+#
+# Distributed under the MIT/X11 software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+
+from mininode import *
+from script import CScript, CScriptOp
+
+# Create a block (with regtest difficulty)
+def create_block(hashprev, coinbase, nTime=None):
+    block = CBlock()
+    if nTime is None:
+        import time
+        block.nTime = int(time.time()+600)
+    else:
+        block.nTime = nTime
+    block.hashPrevBlock = hashprev
+    block.nBits = 0x207fffff # Will break after a difficulty adjustment...
+    block.vtx.append(coinbase)
+    block.hashMerkleRoot = block.calc_merkle_root()
+    block.calc_sha256()
+    return block
+
+def serialize_script_num(value):
+    r = bytearray(0)
+    if value == 0:
+        return r
+    neg = value < 0
+    absvalue = -value if neg else value
+    while (absvalue):
+        r.append(chr(absvalue & 0xff))
+        absvalue >>= 8
+    if r[-1] & 0x80:
+        r.append(0x80 if neg else 0)
+    elif neg:
+        r[-1] |= 0x80
+    return r
+
+counter=1
+# Create an anyone-can-spend coinbase transaction, assuming no miner fees
+def create_coinbase(heightAdjust = 0):
+    global counter
+    coinbase = CTransaction()
+    coinbase.vin.append(CTxIn(COutPoint(0, 0xffffffff), 
+                ser_string(serialize_script_num(counter+heightAdjust)), 0xffffffff))
+    counter += 1
+    coinbaseoutput = CTxOut()
+    coinbaseoutput.nValue = 50*100000000
+    halvings = int((counter+heightAdjust)/150) # regtest
+    coinbaseoutput.nValue >>= halvings
+    coinbaseoutput.scriptPubKey = ""
+    coinbase.vout = [ coinbaseoutput ]
+    coinbase.calc_sha256()
+    return coinbase
+
+# Create a transaction with an anyone-can-spend output, that spends the
+# nth output of prevtx.
+def create_transaction(prevtx, n, sig, value):
+    tx = CTransaction()
+    assert(n < len(prevtx.vout))
+    tx.vin.append(CTxIn(COutPoint(prevtx.sha256, n), sig, 0xffffffff))
+    tx.vout.append(CTxOut(value, ""))
+    tx.calc_sha256()
+    return tx