Update gating (tier0) configuration

- Update outdated FMF/TMT constructs
- Simplify tier0 testing, component rebuilds are an overkill
  in tier0

ci.fmf

@@ -1,19 +1,11 @@
-/test:
+summary: tier0 test plan
-    summary:
+discover:
-        CI plan
+  how: fmf
-    description:
+execute:
-        CI plan
+  how: tmt
-    discover:
+prepare+:
-      - name: ltrace_smoke
+  - how: shell
-        how: fmf
+    script:
-        test: ["/Sanity/testsuite"]
+      - dnf config-manager --set-enabled '*CRB' || true
-        url: "https://src.fedoraproject.org/rpms/ltrace.git"
+      - dnf config-manager --set-enabled '*crb' || true
-      - name: memstomp_smoke
+      - dnf config-manager --set-enabled '*codeready*' || true
-        how: fmf
-        test: ["/Sanity/memstomp-testsuite"]
-        url: "https://src.fedoraproject.org/rpms/memstomp.git"
-      - name: local_tests
-        how: fmf
-        directory: tests
-    execute:
-        how: tmt

tests/show_version/main.fmf

@@ -0,0 +1,4 @@
+summary: the binary runs and know the --version option
+require: dejagnu
+test: dejagnu --version
+duration: 5m