Initialize CONF properly in store func tests

Change-Id: I49b42cc3da15d0966e34a57cfae0bbed79927c7a
Fail sensibly if swiftclient absent in test

Change-Id: Ie44940ede03b6b3d5cff0214dec5d63645fbb584
Prints list-cached dates in isoformat

Converts dates printed by list-cached to a human readable format
(isoformat). It now checks whether the image last_access time is == 0.0
and prints "Not Accessed Yet" if so.

* Updates openstack.common.timeutils
* Fixes bug 1102334

Change-Id: I46f023471ec87fdf74c18f33309279a2f39a4e2a
Fix kwargs in xattr BadDriverConfiguration exc.

Updates an exception in the xattr image_cache driver so that
it uses the correct kwargs for message formatting.

Change-Id: I045de0fcd0237ed2702cf13d911d5b14ea86f45b
Merge "Initialize CONF properly in store func tests"
Stop using detailed-errors plugin for nose.

Because of the move to testtools, the detailed-errors plugin is not only no
longer useful, it actually causes problems, as it fails to process the
error information sent up by testtools.

Part of blueprint grizzly-testtools

Change-Id: I0c8ff489fa92bb4cf7dcd06dd73f14701c013608
Merge "Fail sensibly if swiftclient absent in test"
Merge "Fix kwargs in xattr BadDriverConfiguration exc."
Merge "Prints list-cached dates in isoformat"