Add basic smoke FMF tests

Related: rhbz#1950291

.fmf/version

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+1

plans/basic.fmf

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+summary: python-packaging tests
+description:
+    Basic python-packaging tests
+discover:
+    how: fmf
+execute:
+    how: tmt

tests/main.fmf

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+summary: Tests for python-packaging
+
+require:
+    - python3
+    - python3-packaging
+
+# Currently there is no easy way to see the versions of installed packages.
+# Let's list them to make sure we're testing against the correct package set.
+/display-installed-packages:
+    test: |
+        rpm -qa | sort
+
+/smoke:
+    test: |
+        set -eux
+        python3 -c 'import packaging'
+        python3 -c 'from packaging import version; version.Version("2.5.1rc2")'
+        python3 -c 'from packaging import specifiers; specifiers.SpecifierSet("~=1.0")'
+        python3 -c 'from packaging import markers; markers.Marker("python_version>'"'"'2'"'"'")'
+        python3 -c 'from packaging import requirements; requirements.Requirement('"'"'name[foo]>=2,<3; python_version>"2.0"'"'"')'
+        python3 -c 'from packaging import tags; tags.Tag("py39", "none", "any")'
+        python3 -c 'from packaging.utils import canonicalize_name; canonicalize_name("Django_foobar")'