[etcd] Move etcd storage to tmpfs

The PS allows to use tmpfs for etcd during the gates.
There is an assumption that it will improve the performance and
will allow to get rid of weird issues.

Change-Id: Id68645b6535c9b1d87c133431b7cd6eb50fb030e

tools/deployment/common/005-deploy-k8s.sh

@@ -80,6 +80,10 @@ EOF
 
 configure_resolvconf
 
+# Prepare tmpfs for etcd
+sudo mkdir -p /data
+sudo mount -t tmpfs -o size=512m tmpfs /data
+
 # Install minikube and kubectl
 URL="https://storage.googleapis.com"
 sudo -E curl -sSLo /usr/local/bin/minikube \