test: grpc stream proxy test with test nginx

[bisakhmondal]

What this PR does / why we need it:

1. Creates testfile for grpc streaming proxy
2. delete the old bash file

As we have moved from using bash to test grpc proxy to Test NGINX #5298 (comment).

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[bisakhmondal]

I think we should remove this whole segment, not required anymore (Line 71 - Line 111). WDYT @spacewander?

[spacewander]

OK. Remember to put this back:

# ensure grpc server example is already started
for (( i = 0; i <= 100; i++ )); do
    if [[ "$i" -eq 100 ]]; then
        echo "failed to start grpc_server_example in time"
        exit 1
    fi
    nc -zv 127.0.0.1 50051 && break
    sleep 1
done

[bisakhmondal]

Done. Thanks for pointing it out.

[spacewander]

Better to put a comment here to show why we need to download Go manually.

[bisakhmondal]

Ack.

[spacewander]

Better to add a comment about why this branch is needed

[bisakhmondal]

Ack

[spacewander]

OK. Remember to put this back:

# ensure grpc server example is already started
for (( i = 0; i <= 100; i++ )); do
    if [[ "$i" -eq 100 ]]; then
        echo "failed to start grpc_server_example in time"
        exit 1
    fi
    nc -zv 127.0.0.1 50051 && break
    sleep 1
done