Try fetching a source rpm for installed tmt

plans/try.fmf

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+summary: Basic smoke test
+discover:
+    how: fmf
+execute:
+    how: tmt

tests/try/main.fmf

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+summary: Fetch source rpm
+test: ./test.sh
+framework: beakerlib
+require: tmt

tests/try/test.sh

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+#!/bin/bash
+# vim: dict+=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+rlJournalStart
+    rlPhaseStartSetup
+        rlRun "tmp=\$(mktemp -d)" 0 "Create tmp directory"
+        rlRun "pushd $tmp"
+        rlRun "set -o pipefail"
+    rlPhaseEnd
+
+    rlPhaseStartTest
+        rlFetchSrcForInstalled "tmt"
+        rlRun "ls -la"
+    rlPhaseEnd
+
+    rlPhaseStartCleanup
+        rlRun "popd"
+        rlRun "rm -r $tmp" 0 "Remove tmp directory"
+    rlPhaseEnd
+rlJournalEnd