Tag 2.12.0 release.

Features:

0f7404d Add support for retrieving instance-actions info
59f8360 Add support for the new fixed_ip quota.
d4509dd Removes tenant IDs checking for nova quota operations.
f294635 Show Tenant_ID for secgroup-list with all-tenant
21dca44 Add wrap option to nova credentials for humans
25ae8f0 Allows admins to reset-network of an instance
c0e85a8 Allow extensions to provide a name when discovered on the python path.
a926216 Expand and improve baremetal API.
9f0cf6a Make availability_zone in aggregate_create optional
e800196 Support showing extra fields in server list

Fixes:

d7f1a71 Don't check build/ for pep8 violations
46cd432 Split commands properly for bash completion test.
114bd74 Remove extraneous output during testing
f786178 Use setuptools-git to include files from the repo
609cbce Fix keypair-delete help documents
e9e05d7 Set up debug level on root logger.
301500d Remove unused import
c5b5799 Fix Copyright Headers from LLC to Foundation
b94fbf5 Make os-services API extensions consistent with Nova
65b55d8 Revert API changes in "Unify Manager._update behaviour"
efafde0 Use keyring for testing
f73df49 Additional "Unify Manager._update behaviour" cleanup
1882b99 Check if tenant flag is uuid_like for all quota operations
b606948 Fix nova boot --num-instances option checking
f1e5a88 Fix typo in error message
650f1c3 Extend test coverage for v1_1/shell.py
47e6bc2 Decodes input and encodes output
8ac304f Fixed bug with password prompt, added tests
9ab600f Make ip_protocol parameter in security groups rules case insensitive
feaff79 Fixes the output of 'os-evacuate' command.
aac5767 Update the docstring of cloudpipe-configure command
e043bd1 Accept 201 status code on POST
8be810b Fix how tests were failing due to missing attributes.
34c8a6b Missing import for gnomekeyring
68e6af7 A minimum of Python3 fixes so that installation works without errors/warnings.
92fef8b Remove prov_vlan_id from baremetal
5c8caf0 Add support for os-attach-interfaces
8811ced Added limit to image-list in a preparatory step toward addressing bug 1001345.
f35635b Extend test coverage (shell, fping)
430ef70 Avoid doing a deep copy on the availability zone manager
c97879a Fix nova availability-zone-list for admin users
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