Add OSCI testing harness

Resolves: rhbz#2015560

Signed-off-by: Vladis Dronov <vdronov@redhat.com>

gating.yaml

@@ -0,0 +1,6 @@
+--- !Policy
+product_versions:
+  - rhel-9
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}

tests/README

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+jitterentropy library does not really have tests.
+it is tested as a part of rng-tools tests.

tests/nulltest.sh

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+#!/bin/bash
+
+echo JITTER-LIB nulltest is PASS
+exit 0

tests/tests.yml

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+---
+- hosts: localhost
+  roles:
+  - role: standard-test-basic
+    tags:
+    - classic
+    tests:
+    - nulltest:
+        dir: .
+        run: nulltest.sh