importing libraries for azure.blob needs to be updated in master_script.py

[kusha31]

from azure.storage.blob import BlockBlobService, PageBlobService, AppendBlobService

should be changed to

from azure.storage.blob.pageblobservice import PageBlobService
from azure.storage.blob.appendblobservice import AppendBlobService
from azure.storage.blob.blockblobservice import BlockBlobService