Document Pike cycle artifact signing key

Since the Ocata cycle releases are behind us, document that the
pending key for the Pike cycle is now in place as of 2017-03-24 and
the Ocata key is retired from use beyond that date.

Change-Id: Ief302e29769da1de8c6bc18afc1ac1b38fd17d19

doc/source/index.rst

@@ -176,8 +176,10 @@ date ranges during which each key was in general use.
 
 * 2016-08-03..2016-11-22 (Newton Cycle key):
   `key 0x80fcce3dc49bd7836fc2464664dbb05acc5e7c28`_ (details__)
-* 2016-11-22..present (Ocata Cycle key):
+* 2016-11-22..2017-03-24 (Ocata Cycle key):
   `key 0xd47bab1b7dc2e262a4f6171e8b1b03fd54e2ac07`_ (details__)
+* 2017-03-24..present (Pike Cycle key):
+  `key 0xc96bfb160752606daa0de2fa05eb5792c876df9a`_ (details__)
 
 .. Static key files are generated with the following command:
    ( gpg2 --fingerprint 0x80fcce3dc49bd7836fc2464664dbb05acc5e7c28
@@ -188,6 +190,8 @@ date ranges during which each key was in general use.
 .. __: https://sks-keyservers.net/pks/lookup?op=vindex&search=0x80fcce3dc49bd7836fc2464664dbb05acc5e7c28&fingerprint=on
 .. _`key 0xd47bab1b7dc2e262a4f6171e8b1b03fd54e2ac07`: _static/0xd47bab1b7dc2e262a4f6171e8b1b03fd54e2ac07.txt
 .. __: https://sks-keyservers.net/pks/lookup?op=vindex&search=0xd47bab1b7dc2e262a4f6171e8b1b03fd54e2ac07&fingerprint=on
+.. _`key 0xc96bfb160752606daa0de2fa05eb5792c876df9a`: _static/0xc96bfb160752606daa0de2fa05eb5792c876df9a.txt
+.. __: https://sks-keyservers.net/pks/lookup?op=vindex&search=0xc96bfb160752606daa0de2fa05eb5792c876df9a&fingerprint=on
 
 .. _`centrally-managed OpenPGP keys`: http://docs.openstack.org/infra/system-config/signing.html
 .. _`OpenStack Infrastructure team`: https://governance.openstack.org/tc/reference/projects/infrastructure.html

doc/source/static/0xc96bfb160752606daa0de2fa05eb5792c876df9a.txt

@@ -0,0 +1,54 @@
+pub   rsa2048/0x05EB5792C876DF9A 2017-01-13 [SC] [expires: 2018-01-13]
+      Key fingerprint = C96B FB16 0752 606D AA0D  E2FA 05EB 5792 C876 DF9A
+uid                   [  full  ] OpenStack Infra (Pike Cycle) <infra-root@openstack.org>
+sub   rsa2048/0x6DB4177EBA487468 2017-01-13 [E] [expires: 2018-01-13]
+sub   rsa2048/0xEB6CCA1483FA74EC 2017-01-13 [S]
+
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+-----END PGP PUBLIC KEY BLOCK-----