juju/juju — pull request #864 by axw (2014-09-30 08:14:42+00:00)
Title: provider/bootstrap: verify credentials early, provide user-friendly error message

Verify credentials early in the bootstrap process, and if authentication
fails, provide a user friendly error message. We also remove a redundant
error message from the bootstrap failure case.

This branch only addresses OpenStack; other providers will be addressed
separately.

Partially fixes https://bugs.launchpad.net/juju-core/+bug/1362072