Enable adding packages into Leapp's to_remove/to_install files.

Leapp enables removal and installing packages during the leapp upgrade, so
that the change takes effect during the machines reboot. This patch adds a
mechanism to configure that list of packages via two new heat parameters:
UpgradeLeappToInstall and UpgradeLeappToRemove.

Also, as part of the upgrade from Queens to Train, there is a big jump in the
openvswitch versions, having ovs2.11 in Queens and ovs2.13 in Train, which are
mutually exclusive. This package adds these two pacakges into the to_remove/
to_install mechanism so that the openvswitch package upgrade takes place
during Leapps reboot to upgrade the Operating System.

Change-Id: I2d07f19da68dd17b74189f273e75af3fe1d7a955
(cherry picked from commit 9afe811ef4)

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

@@ -76,6 +76,14 @@ parameters:
     description: Timeout (seconds) for the OS upgrade phase via Leapp
     type: number
     default: 1800
+  UpgradeLeappToRemove:
+    default: []
+    description: List of packages to remove during Leapp upgrade.
+    type: comma_delimited_list
+  UpgradeLeappToInstall:
+    default: []
+    description: List of packages to install after Leapp upgrade.
+    type: comma_delimited_list
   UpgradeInitCommand:
     type: string
     description: |
@@ -125,7 +133,9 @@ outputs:
             - never
             - system_upgrade
             - system_upgrade_prepare
-          when: step|int == 3
+          when:
+            - step|int == 3
+            - upgrade_leapp_enabled
           block:
             - name: Hack around broken ceph-common rpm removing /etc/ceph /var/lib/ceph
               ignore_errors: true
@@ -165,12 +175,24 @@ outputs:
                 -python2-requests
                 -python2-six
                 -python2-urllib3
-              when: upgrade_leapp_enabled
             - name: install leapp
               package:
                 name: leapp
                 state: latest
-              when: upgrade_leapp_enabled
+            - name: "add packages into Leapp's to_remove file"
+              vars:
+                pkg_to_remove: { get_param: UpgradeLeappToRemove }
+              lineinfile:
+                path: "/etc/leapp/transaction/to_remove"
+                line: "{{ item }}"
+              loop: "{{ pkg_to_remove }}"
+            - name: "add packages into Leapp's to_install file"
+              vars:
+                pkg_to_install: { get_param: UpgradeLeappToInstall }
+              lineinfile:
+                path: "/etc/leapp/transaction/to_install"
+                line: "{{ item }}"
+              loop: "{{ pkg_to_install }}"
 
         - name: system_upgrade_prepare step 4
           tags:

environments/lifecycle/upgrade-prepare.yaml

@@ -10,6 +10,8 @@ resource_registry:
 parameter_defaults:
   EnablePackageInstall: true
   UpgradeLevelNovaCompute: auto
+  UpgradeLeappToRemove: ['openvswitch2.11','ovn2.11']
+  UpgradeLeappToInstall: ['openvswitch2.13','ovn2.13']
   UpgradeInitCommonCommand: |
     #!/bin/bash
     set -eu