Too many bq / cloud packages

[stephen-soltesz]

The following packages should be consolidated:

• bqext
• bqx
• cloud/bqfake
• cloudtest
• cloudtest/dsfake
• dataset

This could be reduced to two (preferred) or three packages (at most). If some packages should remain as-is they should be moved to subdirectories of one or the other.

For example:

• bqx :: could include bqext, dataset, and bqxtest package for bqfake and dsfake.
• cloudtest :: could include bqfake an dsfake, and eliminate cloud.

Or, we could combine storagex and cloudtest GCS methods in a helpful way.

Other options are also possible.