openstack: Run minimal tests post-install

This will run the three tests tagged Smoke. We want to gradually
increase the number of tests we can get to consistently pass until
we are able to run the full conformance/parallel.

ci-operator/jobs/openshift/installer/openshift-installer-master-presubmits.yaml

@@ -300,7 +300,7 @@ presubmits:
         - name: JOB_NAME_SAFE
           value: e2e-openstack
         - name: TEST_COMMAND
-          value: run-no-tests
+          value: run-minimal-tests
         image: ci-operator:latest
         imagePullPolicy: Always
         name: ""

ci-operator/templates/openshift/installer/cluster-launch-installer-openstack-e2e.yaml

@@ -166,7 +166,7 @@ objects:
         function run-minimal-tests() {
           # Grab all of the tests marked Feature:Builds and conformance/parallel/minimal 
           openshift-tests run openshift/conformance/parallel --dry-run |
-            grep 'minimal' | grep 'Feature:Builds' |
+            grep 'Smoke' |
           openshift-tests run -o /tmp/artifacts/e2e.log \
             --junit-dir /tmp/artifacts/junit -f -
           exit 0