Add offline cache for kubelet

Pull in an updated version of kubelet which has a local cache which
lets it start pods when offline.

files/edge-core/scripts/edge-core-factory-reset

@@ -5,6 +5,7 @@ rm -f /var/log/syslog*
 
 rm -rf ${SNAP_DATA}/userdata/edge_gw_identity
 snap stop pelion-edge.kubelet || true
+rm -rf ${SNAP_COMMON}/var/lib/kubelet
 
 # Stop and remove all existing docker containers and images
 docker stop $(docker ps -a -q) || true

files/kubelet/scripts/launch-kubelet.sh

@@ -13,6 +13,7 @@ fi
 
 exec ${SNAP}/wigwag/system/bin/kubelet \
     --root-dir=${SNAP_COMMON}/var/lib/kubelet \
+    --offline-cache-path=${SNAP_COMMON}/var/lib/kubelet/store \
     --fail-swap-on=false \
     --image-pull-progress-deadline=2m \
     --hostname-override=${DEVICE_ID} \

snap/snapcraft.yaml

@@ -562,7 +562,7 @@ parts:
     kubelet:
       plugin: go
       source: [email protected]:armPelionEdge/argus.git
-      source-commit: e79ebdac2263e481bb739770d683877f12522c2d
+      source-commit: f3dab5a4f903c2dd165be7d530d4853ad1e9e8cc
       go-importpath: k8s.io/kubernetes
       override-pull: |
         # The go plugin also tries to run go get to fetch project dependencies. We just want to use the vendored depdnencies.
@@ -575,7 +575,7 @@ parts:
         cd go/src/k8s.io
         git clone [email protected]:armPelionEdge/argus.git kubernetes
         cd kubernetes
-        git checkout e79ebdac2263e481bb739770d683877f12522c2d
+        git checkout f3dab5a4f903c2dd165be7d530d4853ad1e9e8cc
       override-build: |
         export GOPATH=${SNAPCRAFT_PART_SRC}/go
         cd ${GOPATH}/src/k8s.io/kubernetes/hack/make-rules