fix(suse): fix support to install compose from PackageHub on 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: