Add another new Cockpit join complete needle

This one from ppc64le test. The difference between all the
recent needles here is the amount of white space between the
'Domain' and 'domain.local'. I don't want to change it to two
match areas as there's a chance we may get a false positive
match when the join actually failed (it may match on 'Domain'
in the right place, and 'domain.local' somewhere else just as
part of the system's hostname). I suppose if this keeps happening
we could try two match areas but include some white space to the
left of 'domain.local' to avoid matching on it as part of the
hostname...

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/cockpit/join_complete-ppc64-20200115.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "width": 223,
+      "type": "match",
+      "xpos": 661,
+      "ypos": 710,
+      "height": 18
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "cockpit_join_complete"
+  ]
+}