feat: basic integration testing with tmt

Introduce a minimal setup for integration tests of insights-client.
The tests are written using pytest and an helper plugin for
insights-client and other Red Hat client tools [1].

The tests are wrapped as single "integration" test for tmt [2], which
makes it possible to run them automatically e.g. in testing-farm.

There is a simple test added to show how the setup for the tests works.

[1] https://github.com/ptoscano/pytest-client-tools/
[2] https://github.com/teemtee/tmt/

Signed-off-by: Pino Toscano <[email protected]>

.fmf/version

@@ -0,0 +1 @@
+1

integration-tests/requirements.txt

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+git+https://github.com/ptoscano/pytest-client-tools@main

integration-tests/test_version.py

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+def test_version(insights_client):
+    proc = insights_client.run("--version")
+    assert b"Client: " in proc.stdout
+    assert b"Core: " in proc.stdout

systemtest/plans/main.fmf

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+summary: rhc test suite
+discover:
+    how: fmf
+
+execute:
+    how: tmt

systemtest/tests/integration/main.fmf

@@ -0,0 +1,3 @@
+summary: Runs tmt tests
+test: ./test.sh
+duration: 10m

systemtest/tests/integration/test.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+set -eu
+set -x
+
+# get to project root
+cd ../../../
+
+dnf --setopt install_weak_deps=False install -y \
+  podman git-core python3-pip python3-pytest
+
+python3 -m venv venv
+# shellcheck disable=SC1091
+. venv/bin/activate
+
+pip install -r integration-tests/requirements.txt
+
+pytest -v integration-tests