NMT GRPC sever URL fix

[MaximumEntropy]

What does this PR do ?

Makes server URL generic for NMT GRPC and not specific to being on localhost

Collection: Tools

Changelog

• Accept server URL directly instead of just a localhost port in client.py

Usage

python tools/nmt_grpc_service/client.py --source_language en --target_language de --text "This is a sentence." --server_url 1.1.1.1:50052

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• Bugfix
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Additional Information

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[aklife97]

LGTM