Add another expected error

hack/e2e.sh

@@ -110,10 +110,12 @@ function test_elasticsearchcluster() {
 test_elasticsearchcluster
 
 function ignore_expected_errors() {
-    # Ignored failures to list navigator API objects when the controller starts
-    # before the API server has started and registered its self. E.g.
+    # Ignore the following error types:
     # E1103 14:58:06.819858       1 reflector.go:205] github.com/jetstack/navigator/pkg/client/informers/externalversions/factory.go:68: Failed to list *v1alpha1.Pilot: the server could not find the requested resource (get pilots.navigator.jetstack.io)
-    egrep --invert-match 'Failed to list \*v1alpha1\.\w+:\s+the server could not find the requested resource\s+\(get \w+\.navigator\.jetstack\.io\)$'
+    # E1108 14:18:37.610718       1 reflector.go:205] github.com/jetstack/navigator/pkg/client/informers/externalversions/factory.go:68: Failed to list *v1alpha1.Pilot: an error on the server ("Error: 'dial tcp 10.0.0.233:443: getsockopt: connection refused'\nTrying to reach: 'https://10.0.0.233:443/apis/navigator.jetstack.io/v1alpha1/pilots?resourceVersion=0'") has prevented the request from succeeding (get pilots.navigator.jetstack.io)
+    egrep --invert-match \
+          -e 'Failed to list \*v1alpha1\.\w+:\s+the server could not find the requested resource\s+\(get \w+\.navigator\.jetstack\.io\)$' \
+          -e 'Failed to list \*v1alpha1\.\w+:\s+an error on the server \([^)]+\) has prevented the request from succeeding\s+\(get \w+\.navigator\.jetstack\.io\)$'
 }
 
 function test_logged_errors() {