Update latest oslo.setup.

Change-Id: If3d397a1a33e14912abb1f7c94790640fe255d3a
Fix _error_out_instance exception handler

Since Eventlet clears exceptions between greenthread switching, we need
to save that exception so it can be re-raised.

The _error_out_instance event handler did not wrap the quotas call with
the save_and_reraise_exception, so the original exception was lost.

Fixes bug 1163552

Change-Id: I69d28917aae1d787351cd800f8996532e5485eb2
Limit the checks for block device becoming available.

Instead of previously looping potentially forever for a block
device mapping to become created from the volume api, basically
blocking a greenthread until this happens we now will have a number
of attempts (defaulting to 10) that we will wait for the volume api
to create said block device mapping (or error out).

Fixes bug 1162064

Change-Id: I6ff0b42aad48df735d09f91a0a9fe98e6abcf2eb
Explain why the give methods are whitelisted.

In order to aid mine (and likely others) understanding of this
code it seems to make sense to document what these special whitelisted
attributes are.

Change-Id: I1c11484fc74e898df5d25ab94ed0cdb288accd67
Merge "Fix _error_out_instance exception handler"
Merge "Limit the checks for block device becoming available."
Merge "Update latest oslo.setup."
Merge "Explain why the give methods are whitelisted."