Add ComputeAlt role and environment

In order to support compute services ppc64le, which currently don't
have supported methods for building and distributing container images,
we create a role 'ComputeAlt' which directly uses the puppet/services
templates to configure services that would typically be containers.

This new role is supposed to minimally diverge from the Compute role

The following services have been switch for the puppet versions:
 - OS::TripleO::Services::ComputeCeilometerAgent
 - OS::TripleO::Services::ComputeNeutronOvsAgent
 - OS::TripleO::Services::Iscsid
 - OS::TripleO::Services::NovaCompute
 - OS::TripleO::Services::NovaLibvirt
 - OS::TripleO::Services::NovaMigrationTarget

The following services have been removed as they're only available as
docker containers:
 - OS::TripleO::Services::Docker
 - OS::TripleO::Services::ContainersLogrotateCrond
 - OS::TripleO::Services::RsyslogSidecar

Alternate versions for the following services are configured, they are
left as OS::Heat::None the operator will need to define them
appropriately if they're needed:
 - OS::TripleO::Services::Collectd
 - OS::TripleO::Services::Fluentd
 - OS::TripleO::Services::SensuClient
 - OS::TripleO::Services::OVNController

Change-Id: I31d673dd048f687c9125733a77d0c9e6069e0614

environments/computealt.yaml

@@ -0,0 +1,19 @@
+resource_registry:
+  OS::TripleO::Services::CollectdAlt: OS::Heat::None
+  # If enabling collectd you'll need provide the following in a specific resource_registry
+  # OS::TripleO::Services::CollectdAlt: ../puppet/services/metrics/collectd.yaml
+  OS::TripleO::Services::ComputeCeilometerAgentAlt: ../puppet/services/ceilometer-agent-compute.yaml
+  OS::TripleO::Services::ComputeNeutronOvsAgentAlt: ../puppet/services/neutron-ovs-agent.yaml
+  OS::TripleO::Services::FluentdAlt: OS::Heat::None
+  # If enabling fluentd you'll need provide the following in a specific resource_registry
+  # OS::TripleO::Services::FluentdAlt: ../puppet/services/logging/fluentd.yaml
+  OS::TripleO::Services::IscsidAlt: ../puppet/services/iscsid.yaml
+  OS::TripleO::Services::NovaComputeAlt: ../puppet/services/nova-compute.yaml
+  OS::TripleO::Services::NovaLibvirtAlt: ../puppet/services/nova-libvirt.yaml
+  OS::TripleO::Services::NovaMigrationTargetAlt: ../puppet/services/nova-migration-target.yaml
+  OS::TripleO::Services::SensuClientAlt: OS::Heat::None
+  # If enabling monitoring you'll need provide the following in a specific resource_registry
+  # OS::TripleO::Services::SensuClientAlt: ../puppet/services/monitoring/sensu-client.yaml
+  OS::TripleO::Services::OVNControllerAlt: OS::Heat::None
+  # If enabling OVN you'll need provide the following in a specific resource_registry
+  # OS::TripleO::Services::OVNControllerAlt: ../puppet/services/ovn-controller.yaml

roles/ComputeAlt.yaml

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+###############################################################################
+# Role: ComputeAlt                                                            #
+###############################################################################
+- name: ComputeAlt
+  description: |
+   Alternate Compute Node role
+  CountDefault: 0
+  networks:
+    - InternalApi
+    - Tenant
+    - Storage
+  HostnameFormatDefault: '%stackname%-novacomputealt-%index%'
+  disable_upgrade_deployment: True
+  disable_constraints: True
+  ServicesDefault:
+    - OS::TripleO::Services::AuditD
+    - OS::TripleO::Services::CACerts
+    - OS::TripleO::Services::CephClient
+    - OS::TripleO::Services::CephExternal
+    - OS::TripleO::Services::CertmongerUser
+    - OS::TripleO::Services::CollectdAlt
+    - OS::TripleO::Services::ComputeCeilometerAgentAlt
+    - OS::TripleO::Services::ComputeNeutronCorePlugin
+    - OS::TripleO::Services::ComputeNeutronL3Agent
+    - OS::TripleO::Services::ComputeNeutronMetadataAgent
+    - OS::TripleO::Services::ComputeNeutronOvsAgentAlt
+    - OS::TripleO::Services::FluentdAlt
+    - OS::TripleO::Services::IscsidAlt
+    - OS::TripleO::Services::Kernel
+    - OS::TripleO::Services::MySQLClient
+    - OS::TripleO::Services::NeutronBgpVpnBagpipe
+    - OS::TripleO::Services::NeutronLinuxbridgeAgent
+    - OS::TripleO::Services::NeutronVppAgent
+    - OS::TripleO::Services::NovaComputeAlt
+    - OS::TripleO::Services::NovaLibvirtAlt
+    - OS::TripleO::Services::NovaMigrationTargetAlt
+    - OS::TripleO::Services::Ntp
+    - OS::TripleO::Services::OpenDaylightOvs
+    - OS::TripleO::Services::Securetty
+    - OS::TripleO::Services::SensuClientAlt
+    - OS::TripleO::Services::SkydiveAgent
+    - OS::TripleO::Services::Snmp
+    - OS::TripleO::Services::Sshd
+    - OS::TripleO::Services::Timezone
+    - OS::TripleO::Services::TripleoFirewall
+    - OS::TripleO::Services::TripleoPackages
+    - OS::TripleO::Services::Tuned
+    - OS::TripleO::Services::Vpp
+    - OS::TripleO::Services::OVNControllerAlt