Moved core asn1 logic to asn1 subpackage

--HG--
rename : scapy/asn1.py => scapy/asn1/asn1.py
rename : scapy/ber.py => scapy/asn1/ber.py
rename : scapy/mib.py => scapy/asn1/mib.py

scapy/asn1/__init__.py

+# We do not import mib.py because it is more bound to scapy and
+# less prone to be used in a standalone fashion
+__all__ = ["asn1","ber"]

scapy/asn1.py → scapy/asn1/asn1.py

 import random
-from error import Scapy_Exception
-from volatile import RandField
-from utils import Enum_metaclass, EnumElement
+from scapy.error import Scapy_Exception
+from scapy.volatile import RandField
+from scapy.utils import Enum_metaclass, EnumElement
 
 class RandASN1Object(RandField):
     def __init__(self, objlist=None):

scapy/mib.py → scapy/asn1/mib.py

 import re
 from glob import glob
-from dadict import DADict
-from config import conf
+from scapy.dadict import DADict
+from scapy.config import conf
 
 #################
 ## MIB parsing ##

scapy/asn1fields.py

-from asn1 import *
-from ber import *
+from asn1.asn1 import *
+from asn1.ber import *
 from volatile import *
 
 #####################