fix proxy build broken by global_dictionary.yaml

[yangminzhu]

I made a comment in https://github.com/istio/api/pull/605/files but think it's faster to send out a PR directly.

@mandarjog
Line 316 - "-" break the proxy build as create_global_dictionary.py parse it to: ""-"", which is invalid in .cc file.

Could you suggest the proper way to fix this? Should we just remove the " or make it \"-\" or even update the script?

[istio-testing]

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[mandarjog]

@yangminzhu can you verify that the resulting file is still a valid yaml file?
There is a go generate command in istio/istio where mixer server generates go code from this.

@bianpengyuan You had faced an issue with -, and I thought we got rid of it.

[bianpengyuan]

@mandarjog instead of removing it, I added some logic to escape " in list generation code in istio/istio#8087.

[yangminzhu]

@bianpengyuan so I think the right way to fix is to also update create_global_dictionary.py to do the same escape? If so I'll update this PR as well. Thanks.

[bianpengyuan]

@yangminzhu Yes I think so. Let's do that.