Revert "simplify bytearray_to_bytestr"

This reverts commit 2c16c37.

Author: pipermerriam

ethereum/utils.py

@@ -35,6 +35,9 @@ def to_string_for_regexp(value):
         return str(value)
     unicode = unicode
 
+    def bytearray_to_bytestr(value):
+        return bytes(''.join(chr(c) for c in value))
+
 else:
     is_numeric = lambda x: isinstance(x, int)
     is_string = lambda x: isinstance(x, bytes)
@@ -56,14 +59,12 @@ def to_string_for_regexp(value):
         return str(to_string(value), 'utf-8')
     unicode = str
 
+    def bytearray_to_bytestr(value):
+        return bytes(value)
 
 isnumeric = is_numeric
 
 
-def bytearray_to_bytestr(value):
-    return bytes(value)
-
-
 def mk_contract_address(sender, nonce):
     return sha3(rlp.encode([normalize_address(sender), nonce]))[12:]