[TRAIN ONLY] Provide way to initialize Leapp

The Leapp utility can require enabling extra repositories and
it must be provided with data [1] to perform in-place upgrade
from RHEL7 to RHEL8. We allow passing thsese with parameters
LeappRepoInitCommand and LeappInitCommand. To make sure most
users will not have to pass LeappInitCommand we sync the files
from Undercloud. Lastly we default the UpgradeLeappCommandOptions
to have default OSP16 repositories enabled forcing users to
either change this value or properly subscribe.

Example:
LeappRepoInitCommand: |
  subscription-manager repos --enable rhel-7-server-rpms
  subscription-manager repos --enable rhel-7-server-extras-rpms
LeappInitCommand: |
  sudo curl -4ksSL -o /etc/leapp/files/pes-events.json https://example.com/pes-events.json
  sudo curl -4ksSL -o /etc/leapp/files/repomap.csv https://example.com/repomap.csv

[1] - https://access.redhat.com/articles/3664871

Resolves: rhbz#1845726
Change-Id: Ibd57468623717273c29d473d32a76f37ae02fa31

deployment/tripleo-packages/tripleo-packages-baremetal-puppet.yaml

@@ -84,6 +84,18 @@ parameters:
     default: []
     description: List of packages to install after Leapp upgrade.
     type: comma_delimited_list
+  LeappRepoInitCommand:
+    type: string
+    description: |
+      Command or script snippet to run on all overcloud nodes to
+      initialize the Leapp process. E.g. a repository switch.
+    default: ''
+  LeappInitCommand:
+    type: string
+    description: |
+      Command or script snippet to run on all overcloud nodes to
+      apply any necessary workarounds to get Leapp working.
+    default: ''
   UpgradeInitCommand:
     type: string
     description: |
@@ -190,10 +202,53 @@ outputs:
                 -python2-requests
                 -python2-six
                 -python2-urllib3
+            - name: Run LeappRepoInitCommand
+              shell:
+                list_join:
+                  - ''
+                  - - "#!/bin/bash\n\n"
+                    - {get_param: LeappRepoInitCommand}
             - name: install leapp
               package:
                 name: leapp
                 state: latest
+            - name: Check that the /etc/leapp/files/pes-events.json exists on UC
+              delegate_to: undercloud
+              stat:
+                path: '/etc/leapp/files/pes-events.json'
+              register: pes_present
+            - name: Check that the /etc/leapp/files/repomap.csv exists on UC
+              delegate_to: undercloud
+              stat:
+                path: '/etc/leapp/files/repomap.csv'
+              register: repomap_present
+            - name: Fetch the Leapp data from undercloud
+              fetch:
+                dest: '{{ playbook_dir }}'
+                src: '{{ item }}'
+              delegate_to: undercloud
+              with_items:
+              - /etc/leapp/files/pes-events.json
+              - /etc/leapp/files/repomap.csv
+              when:
+                - repomap_present.stat.exists
+                - pes_present.stat.exists
+            - name: Copy the Leapp data from undercloud
+              copy:
+                dest: '{{ item }}'
+                src: '{{ playbook_dir }}/{{ inventory_hostname }}/{{ item }}'
+              with_items:
+              - /etc/leapp/files/pes-events.json
+              - /etc/leapp/files/repomap.csv
+              when:
+                - repomap_present.stat.exists
+                - pes_present.stat.exists
+            - name: Run LeappInitCommand
+              shell:
+                list_join:
+                  - ''
+                  - - "#!/bin/bash\n\n"
+                    - {get_param: LeappInitCommand}
             - name: "add packages into Leapp's to_remove file"
               vars:
                 pkg_to_remove: { get_param: UpgradeLeappToRemove }
@@ -259,7 +314,6 @@ outputs:
                 list_join:
                   - ''
                   - - "#!/bin/bash\n\n"
-                    - "if [[ -f /etc/resolv.conf.save ]] ; then rm /etc/resolv.conf.save; fi\n\n"
                     - {get_param: UpgradeInitCommand}
             - name: Run UpgradeInitCommonCommand
               shell:

environments/lifecycle/upgrade-prepare.yaml

@@ -8,6 +8,7 @@ resource_registry:
   OS::TripleO::Services::MongoDb: OS::Heat::None
 
 parameter_defaults:
+  UpgradeLeappCommandOptions: " --enablerepo rhel-8-for-x86_64-baseos-eus-rpms --enablerepo rhel-8-for-x86_64-appstream-eus-rpms --enablerepo rhel-8-for-x86_64-highavailability-eus-rpms --enablerepo advanced-virt-for-rhel-8-x86_64-rpms --enablerepo ansible-2.9-for-rhel-8-x86_64-rpms --enablerepo fast-datapath-for-rhel-8-x86_64-rpms "
   EnablePackageInstall: true
   UpgradeLevelNovaCompute: ''
   UpgradeInitCommonCommand: |