In the current design, the first character of each package is used to create an alias. I'd like to append the first character before underscores in the package name to further reduce conflicts.

Previously google.appengine_admin would have an alias prefix of ga. With this change, the alias prefix will be gaa.

Fixes: #819

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-api-core](https://togithub.com/googleapis/python-api-core) | `==1.26.1` -> `==1.26.2` | [![age](https://badges.renovateapi.com/packages/pypi/google-api-core/1.26.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-api-core/1.26.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-api-core/1.26.2/compatibility-slim/1.26.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-api-core/1.26.2/confidence-slim/1.26.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/python-api-core</summary>

### [`v1.26.2`](https://togithub.com/googleapis/python-api-core/blob/master/CHANGELOG.md#&#8203;1262-httpswwwgithubcomgoogleapispython-api-corecomparev1261v1262-2021-03-23)

[Compare Source](https://togithub.com/googleapis/python-api-core/compare/v1.26.1...v1.26.2)

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The current example is 'auth', which is imported directly by both
transports and unit tests. This name conflicts with any calculated
dependency import whose name happens to be 'auth'.
Fix involves adding 'auth' and other direct, raw imports in templates
to RESERVED_NAMES.

🤖 I have created a release \*beep\* \*boop\*
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### [0.43.2](https://www.github.com/googleapis/gapic-generator-python/compare/v0.43.1...v0.43.2) (2021-03-24)


### Bug Fixes

* add certain raw imports to RESERVED_NAMES ([#824](https://www.github.com/googleapis/gapic-generator-python/issues/824)) ([04bd8aa](https://www.github.com/googleapis/gapic-generator-python/commit/04bd8aaf0fc2c2c0615105cab39dc33266b66775))
* Update module alias to resolve naming conflict ([#820](https://www.github.com/googleapis/gapic-generator-python/issues/820)) ([f5e9f36](https://www.github.com/googleapis/gapic-generator-python/commit/f5e9f367ec6a72b4272f559a93f6fbb3d7e54b8b)), closes [#819](https://www.github.com/googleapis/gapic-generator-python/issues/819)
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