Make extension doc generates snake case.

[bianpengyuan]

Proxy extension is configured with snake case field name instead of camel case. Update doc gen to clarify it.

[ericvn]

Does this also need to be cherry-picked back to 1.9?

[bianpengyuan]

Yeah sure added several cherry-pick labels.

[bianpengyuan]

@istio/wg-policies-and-telemetry-maintainers please take a look, thanks!

[bianpengyuan]

@istio/wg-policies-and-telemetry-maintainers please take a look, thanks!

[mandarjog]

lgtm

[istio-testing]

In response to a cherrypick label: #3191 failed to apply on top of branch "release-1.7":

Applying: Make extension doc generates snake case.
Using index info to reconstruct a base tree...
M	Makefile.core.mk
M	extensions/attributegen/config.pb.html
M	extensions/stackdriver/config/v1alpha1/stackdriver_plugin_config.pb.html
M	extensions/stats/config.pb.html
Falling back to patching base and 3-way merge...
Auto-merging extensions/stats/config.pb.html
CONFLICT (content): Merge conflict in extensions/stats/config.pb.html
Auto-merging extensions/stackdriver/config/v1alpha1/stackdriver_plugin_config.pb.html
CONFLICT (content): Merge conflict in extensions/stackdriver/config/v1alpha1/stackdriver_plugin_config.pb.html
Auto-merging extensions/attributegen/config.pb.html
Auto-merging Makefile.core.mk
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Make extension doc generates snake case.
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

[istio-testing]

In response to a cherrypick label: new issue could not be created for failed cherrypick: status code 410 not one of [201], body: {"message":"Issues are disabled for this repo","documentation_url":"https://docs.github.com/v3/issues/"}

[bianpengyuan]

/cherrypick release-1.9

[istio-testing]

@bianpengyuan: new pull request created: #3206

Details

In response to this:

/cherrypick release-1.9

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