add overriding test scenario to file_groupownership_sshd_pub_key rule

This rule uses directory + regex, it needs a special test scenario because the template does only generic testing.

linux_os/guide/services/ssh/file_groupownership_sshd_pub_key/tests/missing_file_test.pass.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+# platform = multi_platform_ol,multi_platform_rhel
+
+rm -f /etc/ssh/*.pub