Updated samples with etag support

[gwhitehawk]

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• [x ] Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
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Fixes #129 🦕

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• samples/snippets/delete_secret_with_etag.py:22, tag secretmanager_delete_secret_with_etag
• samples/snippets/destroy_secret_version_with_etag.py:22, tag secretmanager_destroy_secret_version_with_etag
• samples/snippets/disable_secret_version_with_etag.py:22, tag secretmanager_disable_secret_version_with_etag
• samples/snippets/enable_secret_version_with_etag.py:22, tag secretmanager_enable_secret_version_with_etag
• samples/snippets/update_secret_with_etag.py:19, tag secretmanager_update_secret_with_etag

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[leahecole]

It seems like lint and the tests are failing - @gwhitehawk please feel free to ping me if you need help debugging these failures from the Python side. I'm not a secret manager expert but can give general python samples advice :)

@sethvargo if you can just give this glance and make sure everything seems appropriately "secret-manager-y" that would also be appreciated

[gwhitehawk]

Thanks for pointing out the problems - I fixed the import issues. Still haven't run unit tests - I can't set up authentication with keys for my service account (as an internal). Can you please re-apply kokoro force-run label?

[gwhitehawk]

@leahecole Seth seemed to appprove but not sure whether he has permission to write. Could you please take another look at the changes? Thanks.

[gwhitehawk]

This is ready for re-review. I set up external non-google project and ran tests locally.