Add tmt smoke test + plan

Cherry-picked from c9s.
Commit hash: 53acc26463

.fmf/version

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+1

plans.fmf

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+discover:
+    how: fmf
+execute:
+    how: tmt

tests/smoke.fmf

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+description: |
+    Runs very simple jinja2 template which should always work
+test: python3 smoke.py
+framework: shell
+require:
+- python3
+- python3-jinja2

tests/smoke.py

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+import jinja2
+
+
+TEMPLATE = "Text {{ variable }}"
+
+environment = jinja2.Environment()
+template = environment.from_string(TEMPLATE)
+output = template.render(variable="demo")
+assert output == "Text demo", f"got: {output}"