Add an example remediation for Hummingbird

A Humminbird remediation for rule `no_host_based_files` has been
added. This demonstrates how the Humminbird should look like
and shows how it differs from a generic Bash remediation.

Author: jan-cerny

linux_os/guide/services/obsolete/r_services/no_host_based_files/hummingbird/shared.sh

@@ -0,0 +1,2 @@
+# platform = multi_platform_all
+find "$NEWROOT" -type f -name "shosts.equiv" -exec rm -f {} \;