Removing use of wheelhouse and relying on Travis caching.

* Chore: update setup.py to new standards

* added end block

* changed required python version

* Edited golden files

* Edited ads-templates setup.py

* added missing commas to setup.py

* changed classifiers for ads-template setup.py

* changed ads-templates setup.py

* Reverted ads-template changes

* Added templeted version and updated protobuf

* added package_root

* Updated golden test files

* Revert "added package_root"

This reverts commit b8ce6142048b2c51f923948aa6ddb007bde50b51.

* Revert "Updated golden test files"

This reverts commit ba37d1342853745471932f2157fa5e385598c498.

* updated setup.py

* Updated Golden files

* added version to __init__.py

* updated api-core dependency

* updated setup.py to match golden

* Changed version.py path to be set automatically

* added version import into _base.py.j2

* changed version import placement

* added changes from incremental-changes-setup-py

* moved constraints file

* updated golden files

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>