scripts: add a new script for running smoke tests

The script `test-smoke.sh` launches a Vagrant VM based on Fedora 26,
to run smoke tests inside the VM for each build.

scripts/test-smoke.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+# Script to test kube-spawn
+
+set -eux
+set -o pipefail
+
+CDIR=$(cd "$(dirname "$0")" && pwd)
+pushd "$CDIR"
+trap 'popd' EXIT
+
+if ! vagrant version > /dev/null 2>&1; then
+  echo "Please install vagrant first"
+  exit 1
+fi
+
+MSTATUS="$(vagrant status fedora |grep fedora|awk -F' ' '{print $2}')"
+if [[ "${MSTATUS}" == "running" ]]; then
+	vagrant halt fedora
+fi
+
+vagrant up fedora --provider=virtualbox
+
+vagrant ssh fedora -c " \
+	sudo setenforce 0; \
+	go get -u github.com/containernetworking/plugins/plugins/... && \
+	cd ~/go/src/github.com/kinvolk/kube-spawn && \
+	make dep vendor all && \
+	sudo -E go test -v --tags integration ./tests \
+	"
+RESCODE=$?
+if [[ "${RESCODE}" -eq 0 ]]; then
+	RES="SUCCESS"
+else
+	RES="FAILURE"
+fi
+
+echo "Test result: ${RES}"
+
+trap 'vagrant halt fedora' EXIT