Implement a Minimal role

Add a new role, called "Minimal", which has the strict minimum services
that need to run on a host.
This can be used as a reference when creating custom roles with custom
services (e.g. third party).

Change-Id: I6484d97d0f044de153404516bce0ea7fc2a5f0e1

roles/Minimal.yaml

@@ -0,0 +1,30 @@
+###############################################################################
+# Role: Minimal                                                               #
+###############################################################################
+- name: Minimal
+  description: |
+    Standalone minimal role with required services not managed by Pacemaker
+  networks:
+    InternalApi:
+      subnet: internal_api_subnet
+  HostnameFormatDefault: '%stackname%-messaging-%index%'
+  ServicesDefault:
+    - OS::TripleO::Services::Aide
+    - OS::TripleO::Services::AuditD
+    - OS::TripleO::Services::BootParams
+    - OS::TripleO::Services::CACerts
+    - OS::TripleO::Services::CertmongerUser
+    - OS::TripleO::Services::IpaClient
+    - OS::TripleO::Services::Ipsec
+    - OS::TripleO::Services::Kernel
+    - OS::TripleO::Services::LoginDefs
+    - OS::TripleO::Services::ContainersLogrotateCrond
+    - OS::TripleO::Services::Podman
+    - OS::TripleO::Services::Rhsm
+    - OS::TripleO::Services::Rsyslog
+    - OS::TripleO::Services::Snmp
+    - OS::TripleO::Services::Timesync
+    - OS::TripleO::Services::Timezone
+    - OS::TripleO::Services::TripleoFirewall
+    - OS::TripleO::Services::TripleoPackages
+    - OS::TripleO::Services::Tuned

roles/README.rst

@@ -111,6 +111,7 @@ Example
   ControllerOpenstack
   Database
   Messaging
+  Minimal
   Networker
   ObjectStorage
   Telemetry