Remove reference to Shell from jenkins/e2e.sh

hack/jenkins/e2e.sh

@@ -109,7 +109,6 @@ GKE_REQUIRED_SKIP_TESTS=(
     "Nodes"
     "Etcd\sFailure"
     "MasterCerts"
-    "Shell"
     "Daemon\sset"
     "Deployment"
     "experimental\sresource\susage\stracking" # Expect --max-pods=100
@@ -156,7 +155,6 @@ GCE_PARALLEL_SKIP_TESTS=(
     "Resource\susage\sof\ssystem\scontainers"
     "SchedulerPredicates"
     "Services.*restarting"
-    "Shell.*services"
     "resource\susage\stracking"
     )