Accepting request 567735 from home:cyphar:containers:docker_obsoletes_image-migrator

- Add Obsoletes: docker-image-migrator, as the tool is no longer needed and
  we've pretty much removed it from everywhere except the containers module.
  bsc#1069758

OBS-URL: https://build.opensuse.org/request/show/567735
OBS-URL: https://build.opensuse.org/package/show/Virtualization:containers/docker?expand=0&rev=233

docker.spec

@@ -117,6 +117,9 @@ Requires:       xz >= 4.9
 Requires(post): %fillup_prereq
 Requires(post): udev
 Requires(post): shadow
+# We used to have a migration tool for the upgrade from v1.9.x to v1.10.x.
+# It is no longer useful, so we obsolete it. bsc#1069758
+Obsoletes:      docker-image-migrator
 # Not necessary, but must be installed when the underlying system is
 # configured to use lvm and the user doesn't explicitly provide a
 # different storage-driver than devicemapper