Glance image-list failed when image number exceed DEFAULT_PAGE_SIZE

The root cause of the problem is that DB2 does not allow
an empty string ('') for datetime field. So we set the
default value of datetime as None.

Fixes bug 1245947

Change-Id: Ie372efe70a068024298fbde4574e33e565cc6c9a
(cherry picked from commit 3f533a28fa79e5ad7d2703123565f34839cd9ff3)
glance requires pyOpenSSL>=0.11

glance uses  OpenSSL.crypto.sign() and OpenSSL.crypto.verify(), which
are new in pyOpenSSL 0.11. Global requirements already fixed, do the
same change in glance

Change-Id: I20ba38a174548c5a5a501351fb9a1a33b235b0b4
Partial-Bug: #1268966
Bump stable/havana next version to 2013.2.3

Change-Id: Ia5b940faf01df6cae58df1f4b4f5e8fa2f3f078a
Prevent E500 when delayed delete is enabled

If delayed delete is enabled the user token was not being propagated
properly to the registry in all cases. This resulted in an authentication
error when the API attempted to connect to the registry, which in turn
caused a 500 error from the API.

Fix for bug 1238604.

Also, place a restriction on the highest version of python-swiftclient
for the havana stable branch.

Change-Id: Ifafc1613db034508abfce7ba5e4df582e6056c10
Raise max header size to accommodate large tokens

The former max header (8192) is exceeded in the following scenario
- Auth tokens built with a keystone v3 API catalog
- A catalog with approximately 8 or more endpoints defined

Equivalent fixes have been proposed in other projects

Change-Id: Ic714166440e2aa08b619ab1e5e5e0cf3cea3e309
Closes-Bug: 1190149
Merge "Glance image-list failed when image number exceed DEFAULT_PAGE_SIZE" into stable/havana
Merge "glance requires pyOpenSSL>=0.11" into stable/havana
Merge "Prevent E500 when delayed delete is enabled" into stable/havana
Remove runtime dep on python pbr
Don't access the net while building docs

(Note this hasn't been submitted upstream)

Change-Id: I42c6e3a5062db209a0abe00cebc04d383c79cbcb
(cherry picked from commit f2b4bb4e45afcc178200966193a7b87401c534d7)