Closes #174 Specify domain filtering uses environment domain variable

[EeethB]

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Changes Description

Closes #174

Specify domain filtering uses environment variable

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[github-actions]

Package	Line Rate	Health
xportr	100%	✔
Summary	100% (785 / 785)	✔

[bms63]

whew!! that was much easier then I thought it was going to be!

@atorus-research/xportr-development-team any misgivings?

[bms63]

Original issue author has tested and confirmed fix