Fix an issue with aliasing apiclient submodules.
Fix an issue with aliasing apiclient submodules.

The aliasing of `googleapiclient` as `apiclient` doesn't play nicely with
imports of the form `from apiclient import foo`. This is far from the most
elegant fix, but it gets the job done.

googleapis/google-api-python-client,googleapis/google-api-python-client