Replace md5 module with hashlib

fix following pylint error:

************* Module connectors.ConnectorBase
connectors/ConnectorBase.py:7: [W1648(bad-python3-import), ] Module moved in Python 3
************* Module runtime.PLCObject
runtime/PLCObject.py:33: [W1648(bad-python3-import), ] Module moved in Python 3

     1

[TOPOLOGY]

     2

NetName=None

     3

Nodes=0x01

     4

Node64Present=0x01

     5

Node64Name=micromod

     6

Node64DCFName=PEAK MicroMod.eds

     7

EDSBaseName=eds