Release 0.4.0

This tempest-lib release includes:
 * A new console script entry point skip-tracker to identify @skip_because
   decorators and query launchpad if the bug is closed or not
 * Documentation Improvements
 * A fix for rest client logging levels
 * Adds the v2 and v3 token clients from tempest
 * Adds the AuthProvider layer and credentials objects from tempest
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