replace.py: Moved replace func,mitm: addr book replace

Moved the replace function from mitm.py to replace.py.

This implementation is context insensitive for now. It would be
better, to have a mitm class or to pass state information to the
function. Because how else can the MITM code know, whether it gets
passed data to or from the sim card, to or from the phone?

usb_application/mitm.py

@@ -12,6 +12,8 @@ from util import HEX
 from constants import *
 from apdu_split import Apdu_splitter, apdu_states
 
+from replace import replace
+
 def pattern_match(inpt):
     print("Matching inpt", inpt)
     if (inpt == ATR_SYSMOCOM1) or (inpt == ATR_STRANGE_SIM):
@@ -38,24 +40,6 @@ def write_phone(dev, resp):
     print("WR: ", HEX(resp))
     dev.write(PHONE_WR, resp, 10)
 
-def replace(data):
-    if data is None:
-        raise MITMReplaceError
-    else:
-        try:
-            if data[0] == 0x3B:
-                print("*** Replace ATR")
-                return array('B', NEW_ATR)
-            elif data[0] == 0x9F:
-                print("*** Replace return val")
-#                return array('B', [0x60, 0x00])
-            elif data == PHONE_BOOK_RESP:
-                print("*** Replace phone book")
-                return PHONE_BOOK_RESP_MITM
-        except ValueError:
-            print("*** Value error! ")
-    return data
-
 def do_mitm(dev, sim_emul=True):
     if sim_emul == True:
         my_class = SmartCardEmulator