generation one swagger file out of multiple protos

[zxy198717]

Issue:

#99

Usage:

bash -c "protoc -I=. ./*services.proto --swagger_out=allow_delete_body=true,allow_merge=true,logtostderr=true:."

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[zxy198717]

I signed it!

[googlebot]

CLAs look good, thanks!

[achew22]

Would it be possible to add a test to verify this functionality? Could you also rebase this PR to see how the CI feels about it?

[achew22]

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