Add support for linux-system-api test harness

Also add a simple test that runs the role without any parameters.

run-tests.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Run integration test for this repository. It fetches the test harness from
+# docker.io, which is built from
+#
+#   http://github.com/linux-system-roles/test-harness
+
+set -xeuf -o pipefail
+
+CACHEDIR=${CACHEDIR:-$PWD/.image-cache}
+mkdir -p $CACHEDIR
+
+docker run --privileged \
+           --rm \
+           --volume $PWD:/role \
+           --volume $CACHEDIR:/cache \
+           cockpit/linux-system-roles-test

semaphore

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+#!/bin/bash
+
+# Run integration tests on semaphoreci.com.
+
+set -xeuf -o pipefail
+
+prepare() {
+  # install qemu because its post install script sets up /dev/kvm
+  sudo apt-get update
+  sudo apt-get install -q -y qemu-system-x86
+  sudo chmod a+rw /dev/kvm
+}
+
+run() {
+  docker-cache restore
+
+  CACHEDIR=$SEMAPHORE_CACHE_DIR ./run-tests.sh | tee
+
+  docker-cache snapshot
+}
+
+"$@"

test/.gitignore

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+/*.retry
+/inventory

test/roles/network

@@ -0,0 +1 @@
+../..

test/test_default.yml

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+---
+- hosts: all
+  roles:
+    - network