Migrate over to using pyosmocom

We're creating a 'pyosmocom' pypi module which contains a number of core
Osmocom libraries / interfaces that are not specific to SIM card stuff
contained here.

The main modules moved in this initial step are pySim.tlv, pySim.utils
and pySim.construct. utils is split, not all of the contents is
unrelated to SIM Cards.  The other two are moved completely.

Change-Id: I4b63e45bcb0c9ba2424dacf85e0222aee735f411

pySim/sysmocom_sja2.py

@@ -21,11 +21,11 @@ from struct import unpack
 from construct import FlagsEnum, Byte, Struct, Int8ub, Bytes, Mapping, Enum, Padding, BitsInteger
 from construct import Bit, this, Int32ub, Int16ub, Nibble, BytesInteger, GreedyRange, Const
 from construct import Optional as COptional
+from osmocom.utils import *
+from osmocom.construct import *
 
-from pySim.utils import *
 from pySim.filesystem import *
 from pySim.runtime import RuntimeState
-from pySim.construct import *
 import pySim
 
 key_type2str = {