Comment 4 for bug 1031022

Reviewed: https://review.openstack.org/10627
Committed: http://github.com/openstack/keystone/commit/ac4dcfd8f64dfe19d607b770eb98dd289498d3ac
Submitter: Jenkins
Branch: master

commit ac4dcfd8f64dfe19d607b770eb98dd289498d3ac
Author: Adam Young <email address hidden>
Date: Tue Jul 31 16:41:47 2012 -0400

    Use user home dir as default for cache

    This is a better and safer default, as it and minimizes the
    possibility that the cache directory will be prepopulated or
    unwritable, while still providing a reasonable value for the
    individual developer

    Creates a better exception for failure to create the cache
    dir

    Logs the name of the cache dir actually used.

    Bug 1031022

    Change-Id: Ia3718107e436ceb034e3a89318ac05265d66d6f1