Add tmt smoke test

.fmf/version

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+1

plans/smoke.fmf

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+summary: Basic smoke test
+discover:
+  how: fmf
+  filter: "tag: smoke"
+prepare:
+- name: packages
+  how: install
+  package: [ostree]
+execute:
+  how: tmt
+

tests/smoke/main.fmf

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+summary: runs ostree --version and checks return code 
+test: ./test.sh
+tag:
+- smoke

tests/smoke/test.sh

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+#!/bin/bash
+
+ostree --version