Minor updates to parse_box_config.py

[vaibhavmwarpe]

Hi Kyle, I am using these blueprints, really helpful. Thank you. Please note the below changes I needed to make in parse_box_config.py

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When using Popen function in def "convertCryptoKey" it errors out "file not found".
Fix

1. add shell=True
2. provide full path for openssl.exe and tempKey.txt

In def "modifyPkString", first decode the newKey - otherwise errors out "a bytes like object is required, not str"
Fix
3. withoutFirstLine = newKey.decode().split('\n')[1:]

[DarrinDipity]

Had same issue with convertCryptoKey returning a ByteArray and modifyPkString expecting a String. Added the decode() method to the array and then worked fine.