Fix a couple typos in the nova.exception module

This patch fixes a couple of typos in localized user-facing strings in
the nova.exception module.

Fixes bug 1194944

Change-Id: Ia85e69c23832ab4fd9f56c525075bd30bf4b059e
Remove broken config_drive image_href support.

image_href support has not been working since at least shortly before
Folsom release.  This is a good indication that this functionality is not
used.  As far as I can tell, the docs also do not match what was
supported.  An image ID was required, but docs show examples with full
hrefs.

DocImpact

http://docs.openstack.org/developer/nova/api_ext/ext_config_drive.html

References to supporting image_hrefs should be removed.

This patch also removes the hack that passed a config_drive_id via
the Instance dictionary when config_drive_id is not a valid Column for
Instance.

Fixes bug 1186401

Change-Id: Iced7bc8e278cb9f208183f1dbb7a293675a47eae
Merge "Fix a couple typos in the nova.exception module"
Merge "Remove broken config_drive image_href support."
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp