Install openafs-modules-dkms before openafs-client / openafs-krb5

Again, this works properly under trusty, but xenial we need to have a
proper depenency. This is also the order under centos-7.

Change-Id: I6031f3d641e0a0b03c63c251de7a6d1c8310b7f9
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

manifests/client.pp

@@ -112,6 +112,10 @@ class openafs::client (
     }
     package { $openafs_dkms:
       ensure => present,
+      before => [
+        Package['openafs-client'],
+        Package['openafs-krb5'],
+      ],
     }
   }