Set eviction-hard for vagrant cluster

In order to test eviction related functionality it will be convenient
to have reasonable eviction defaults.
At this moment exactly same flags are used by GCE environment

kubelet will have a following flag:

  --eviction-hard=memory.available<100Mi,nodefs.available<10%

Change-Id: I56ca03bc3c5467c8450150e292f7a346fa7772a9

cluster/vagrant/config-default.sh

@@ -115,3 +115,6 @@ E2E_STORAGE_TEST_ENVIRONMENT=${KUBE_E2E_STORAGE_TEST_ENVIRONMENT:-false}
 
 # Default fallback NETWORK_IF_NAME, will be used in case when no 'VAGRANT-BEGIN' comments were defined in network-script
 export DEFAULT_NETWORK_IF_NAME="eth0"
+
+# Evict pods whenever compute resource availability on the nodes gets below a threshold.
+EVICTION_HARD="${EVICTION_HARD:-memory.available<100Mi,nodefs.available<10%}"

cluster/vagrant/config-test.sh

@@ -26,3 +26,6 @@ REGISTER_MASTER_KUBELET=${REGISTER_MASTER:-false}
 
 # Optional: if set to true, kube-up will configure the cluster to run e2e tests.
 E2E_STORAGE_TEST_ENVIRONMENT=${KUBE_E2E_STORAGE_TEST_ENVIRONMENT:-false}
+
+# Evict pods whenever compute resource availability on the nodes gets below a threshold.
+EVICTION_HARD="${EVICTION_HARD:-memory.available<100Mi,nodefs.available<10%}"

cluster/vagrant/provision-utils.sh

@@ -78,6 +78,12 @@ opencontrail_public_subnet: '$(echo "$OPENCONTRAIL_PUBLIC_SUBNET" | sed -e "s/'/
 e2e_storage_test_environment: '$(echo "$E2E_STORAGE_TEST_ENVIRONMENT" | sed -e "s/'/''/g")'
 EOF
 
+if [ -n "${EVICTION_HARD:-}" ]; then
+  cat <<EOF >>/srv/salt-overlay/pillar/cluster-params.sls
+eviction_hard: '$(echo "${EVICTION_HARD}" | sed -e "s/'/''/g")'
+EOF
+fi
+
   cat <<EOF >/etc/salt/minion.d/log-level-debug.conf
 log_level: warning
 log_level_logfile: warning

cluster/vagrant/util.sh

@@ -188,6 +188,7 @@ function echo-kube-env() {
   echo "OPENCONTRAIL_PUBLIC_SUBNET='${OPENCONTRAIL_PUBLIC_SUBNET:-}'"
   echo "E2E_STORAGE_TEST_ENVIRONMENT='${E2E_STORAGE_TEST_ENVIRONMENT:-}'"
   echo "CUSTOM_FEDORA_REPOSITORY_URL='${CUSTOM_FEDORA_REPOSITORY_URL:-}'"
+  echo "EVICTION_HARD='${EVICTION_HARD:-}'"
 }
 
 function verify-cluster {