kubernetes: 1.6 -> 1.5 Downgrade jobs failing

Currently the 1.6 -> 1.5 downgrade jobs are failing: gce-1.6-1.5-downgrade-cluster

Expected error:
    <*errors.errorString | 0xc4208102d0>: {
        s: "error running /workspace/kubernetes_skew/cluster/gce/upgrade.sh [-M v1.5.5-beta.0.14+0fb9a2d414403e]; got error signal: interrupt, stdout \"== Pre-Upgrade Node OS and Kubelet Versions ==\\nname: \\\"bootstrap-e2e-master\\\", osImage: \\\"Container-Optimized OS from Google\\\", kubeletVersion: \\\"v1.6.0-beta.4.81+2c160759f37fb8\\\"\\nname: \\\"bootstrap-e2e-minion-group-4v5v\\\", osImage: \\\"Debian GNU/Linux 7 (wheezy)\\\", kubeletVersion: \\\"v1.5.5-beta.0.14+0fb9a2d414403e\\\"\\nname: \\\"bootstrap-e2e-minion-group-dmcl\\\", osImage: \\\"Debian GNU/Linux 7 (wheezy)\\\", kubeletVersion: \\\"v1.5.5-beta.0.14+0fb9a2d414403e\\\"\\nname: \\\"bootstrap-e2e-minion-group-lsrw\\\", osImage: \\\"Debian GNU/Linux 7 (wheezy)\\\", kubeletVersion: \\\"v1.5.5-beta.0.14+0fb9a2d414403e\\\"\\n== Upgrading master to 'https://storage.googleapis.com/kubernetes-release-dev/ci/v1.5.5-beta.0.14+0fb9a2d414403e/kubernetes-server-linux-amd64.tar.gz'. Do not interrupt, deleting master instance. ==\\nNAME                  ZONE           MACHINE_TYPE   PREEMPTIBLE  INTERNAL_IP  EXTERNAL_IP     STATUS\\nbootstrap-e2e-master  us-central1-f  n1-standard-1               10.240.0.2   35.184.192.247  RUNNING\\n== Waiting for new master to respond to API requests ==\\n\", stderr \"Project: k8s-gce-dg-1-6-1-5-dwngr-clu\\nZone: us-central1-f\\nINSTANCE_GROUPS=bootstrap-e2e-minion-group\\nNODE_NAMES=bootstrap-e2e-minion-group-4v5v bootstrap-e2e-minion-group-dmcl bootstrap-e2e-minion-group-lsrw\\nTrying to find master named 'bootstrap-e2e-master'\\nLooking for address 'bootstrap-e2e-master-ip'\\nUsing master: bootstrap-e2e-master (external IP: 35.184.192.247)\\nDeleted [https://www.googleapis.com/compute/v1/projects/k8s-gce-dg-1-6-1-5-dwngr-clu/zones/us-central1-f/instances/bootstrap-e2e-master].\\nWARNING: You have selected a disk size of under [200GB]. This may result in poor I/O performance. For more information, see: https://developers.google.com/compute/docs/disks#pdperformance.\\nCreated [https://www.googleapis.com/compute/v1/projects/k8s-gce-dg-1-6-1-5-dwngr-clu/zones/us-central1-f/instances/bootstrap-e2e-master].\\n\"",
    }
    error running /workspace/kubernetes_skew/cluster/gce/upgrade.sh [-M v1.5.5-beta.0.14+0fb9a2d414403e]; got error signal: interrupt, stdout "== Pre-Upgrade Node OS and Kubelet Versions ==\nname: \"bootstrap-e2e-master\", osImage: \"Container-Optimized OS from Google\", kubeletVersion: \"v1.6.0-beta.4.81+2c160759f37fb8\"\nname: \"bootstrap-e2e-minion-group-4v5v\", osImage: \"Debian GNU/Linux 7 (wheezy)\", kubeletVersion: \"v1.5.5-beta.0.14+0fb9a2d414403e\"\nname: \"bootstrap-e2e-minion-group-dmcl\", osImage: \"Debian GNU/Linux 7 (wheezy)\", kubeletVersion: \"v1.5.5-beta.0.14+0fb9a2d414403e\"\nname: \"bootstrap-e2e-minion-group-lsrw\", osImage: \"Debian GNU/Linux 7 (wheezy)\", kubeletVersion: \"v1.5.5-beta.0.14+0fb9a2d414403e\"\n== Upgrading master to 'https://storage.googleapis.com/kubernetes-release-dev/ci/v1.5.5-beta.0.14+0fb9a2d414403e/kubernetes-server-linux-amd64.tar.gz'. Do not interrupt, deleting master instance. ==\nNAME                  ZONE           MACHINE_TYPE   PREEMPTIBLE  INTERNAL_IP  EXTERNAL_IP     STATUS\nbootstrap-e2e-master  us-central1-f  n1-standard-1               10.240.0.2   35.184.192.247  RUNNING\n== Waiting for new master to respond to API requests ==\n", stderr "Project: k8s-gce-dg-1-6-1-5-dwngr-clu\nZone: us-central1-f\nINSTANCE_GROUPS=bootstrap-e2e-minion-group\nNODE_NAMES=bootstrap-e2e-minion-group-4v5v bootstrap-e2e-minion-group-dmcl bootstrap-e2e-minion-group-lsrw\nTrying to find master named 'bootstrap-e2e-master'\nLooking for address 'bootstrap-e2e-master-ip'\nUsing master: bootstrap-e2e-master (external IP: 35.184.192.247)\nDeleted [https://www.googleapis.com/compute/v1/projects/k8s-gce-dg-1-6-1-5-dwngr-clu/zones/us-central1-f/instances/bootstrap-e2e-master].\nWARNING: You have selected a disk size of under [200GB]. This may result in poor I/O performance. For more information, see: https://developers.google.com/compute/docs/disks#pdperformance.\nCreated [https://www.googleapis.com/compute/v1/projects/k8s-gce-dg-1-6-1-5-dwngr-clu/zones/us-central1-f/instances/bootstrap-e2e-master].\n"
not to have occurred

gke-gci-1.6-gci-1.5-downgrade-cluster

Mar 21 03:12:01.772: Failed to allocated static ip e2e-tests-ingress-upgrade-zszrb-static-ip: googleapi: Error 403: Quota 'STATIC_ADDRESSES' exceeded. Limit: 7.0, quotaExceeded****

Looks like this could be for different reasons.