fix(suse): Fix support for SLES 15

To actually install the packages, you need to set the following in your
pillar because the PackageHub repos are not enabled by default on SLES.

```YAML
docker:
  pkg:
    docker:
      use_upstream: 'package'
    compose:
      use_upstream: 'package'
```

docker/codenamemap.yaml

@@ -22,3 +22,15 @@ precise:
     deps:
       - linux-image-generic-lts-raring
       - linux-headers-generic-lts-raring
+
+SUSE Linux Enterprise Server 15:
+  pkg:
+    compose:
+      commands:
+        - docker-compose
+
+SUSE Linux Enterprise Server 15 SP1:
+  pkg:
+    compose:
+      commands:
+        - docker-compose

docker/osfamilymap.yaml

@@ -73,6 +73,10 @@ Suse:
       - gzip
     docker:
       name: docker
+    compose:
+      # https://packagehub.suse.com/packages/python-docker-compose/
+      commands:
+        - python-docker-compose
 
 MacOS:
   identity: