Fixed Mirantis repo key setting for docker and ceph repo

The apt key had incorrect substitution for Mirantis ceph and docker
repos. Fixed to point to the appropriate key manifest.

Also corrected the default branch in .gitreview.

Change-Id: I6a415376a9722366510be4efe79d8896498f0d5f
Signed-off-by: James Gu <james.gu@att.com>

.gitreview

@@ -2,3 +2,4 @@
 host=review.opendev.org
 port=29418
 project=airship/treasuremap.git
+defaultbranch=v1.8-prime

global/software/config/versions.yaml

@@ -44,11 +44,17 @@ metadata:
         path: .
       dest:
         - path: .packages.repositories.main_archive.gpgkey
-        - path: .packages.repositories.ceph.gpgkey
-        - path: .packages.repositories.docker.gpgkey
         - path: .packages.repositories.linux_dell.gpgkey
         - path: .packages.repositories.nc_extra.gpgkey
         - path: .packages.repositories.zfs_dkms.gpgkey
+    # mirantis apt repository keys
+    - src:
+        schema: deckhand/PublicKey/v1
+        name: mirantis_repo_key
+        path: .
+      dest:
+        - path: .packages.repositories.ceph.gpgkey
+        - path: .packages.repositories.docker.gpgkey
     # apt urls
     - src:
         schema: pegleg/CommonAddresses/v1