List the Ussuri cycle signing key as current

This sets the end date for the Train key, adds the Ussuri key
starting today and links to a minimal export of the corresponding
public key and its details on the keyserver network. This can be
amended with a new patchset or a follow-up change to correct the
included dates after the key material change (Depends-On below)
merges and goes into effect.

Depends-On: https://review.opendev.org/691939
Change-Id: Id8e4d24fa18cccffb2da3acd987cfbf01efd3bae

doc/source/index.rst

@@ -102,8 +102,10 @@ date ranges during which each key was in general use.
   `key 0xc31292066be772022438222c184fd3e1edf21a78`_ (details__)
 * 2018-09-05..2019-06-11 (Stein Cycle key):
   `key 0x27023b1ffccd8e3ae9a5ce95d943d5d270273ada`_ (details__)
-* 2019-06-11..present (Train Cycle key):
+* 2019-06-11..2019-10-29 (Train Cycle key):
   `key 0xcdc08088c3cb45a9be08332b2354069e5b504663`_ (details__)
+* 2019-10-29..present (Ussuri Cycle key):
+  `key 0xbba3b1e67a7303dd1769d34595bf2e4d09004514`_ (details__)
 
 .. Static key files are generated with the following command:
    ( gpg2 --fingerprint 0x80fcce3dc49bd7836fc2464664dbb05acc5e7c28
@@ -124,6 +126,8 @@ date ranges during which each key was in general use.
 .. __: https://sks-keyservers.net/pks/lookup?op=vindex&search=0x27023b1ffccd8e3ae9a5ce95d943d5d270273ada&fingerprint=on
 .. _`key 0xcdc08088c3cb45a9be08332b2354069e5b504663`: _static/0xcdc08088c3cb45a9be08332b2354069e5b504663.txt
 .. __: https://sks-keyservers.net/pks/lookup?op=vindex&search=0xcdc08088c3cb45a9be08332b2354069e5b504663&fingerprint=on
+.. _`key 0xbba3b1e67a7303dd1769d34595bf2e4d09004514`: _static/0xbba3b1e67a7303dd1769d34595bf2e4d09004514.txt
+.. __: https://sks-keyservers.net/pks/lookup?op=vindex&search=0xbba3b1e67a7303dd1769d34595bf2e4d09004514&fingerprint=on
 
 .. _`centrally-managed OpenPGP keys`: https://docs.openstack.org/infra/system-config/signing.html
 .. _`OpenStack Infrastructure team`: https://governance.openstack.org/tc/reference/projects/infrastructure.html

doc/source/static/0xbba3b1e67a7303dd1769d34595bf2e4d09004514.txt

@@ -0,0 +1,74 @@
+pub   rsa3072/0x95BF2E4D09004514 2019-10-01 [SC] [expires: 2020-06-27]
+      Key fingerprint = BBA3 B1E6 7A73 03DD 1769  D345 95BF 2E4D 0900 4514
+uid                   [ unknown] OpenStack Infra (Ussuri Cycle) <infra-root@openstack.org>
+sub   rsa3072/0xBC0B0AD02C5E5A01 2019-10-01 [E] [expires: 2020-06-27]
+sub   rsa3072/0x4F398DEAE440091C 2019-10-01 [S]
+
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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+-----END PGP PUBLIC KEY BLOCK-----