Permit pre-release versions with git metadata

This is implied by the example and seems necessary for doing automated
generation of pre-release versions.

Change-Id: I8d4ceec200fac7982f2dafa7f8f1a8abfd4b0f83
Make setUp fail if sdist fails.

Hygiene - fail at the point of failure, not later.

Change-Id: Id0328f1afad5dd2fb4f5ef22e025d60eef1d4e52
Merge "Permit pre-release versions with git metadata"
Merge "Make setUp fail if sdist fails."