Only set EnableConfigPurge on major upgrades

Bug #1611800 fixed an upgrade issue by enabling purging configs for
some services, but this causes issues such as longer updates and
restarting services in the minor update case, so only do this for
major upgrades, and default to false.

 Conflicts: (don't exist on this branch or are renamed)
	environments/major-upgrade-composable-steps-docker.yaml
	environments/major-upgrade-converge-docker.yaml
	environments/major-upgrade-composable-steps.yaml
	environments/major-upgrade-converge.yaml
	puppet/services/octavia-base.yaml

Related-Bug: #1611800
Closes-Bug: #1674858
Change-Id: Iff7d715f6730c5633f1146008504b4309ef3133d
(cherry picked from commit 947a7148e8)
(cherry picked from commit c71229f092)

environments/major-upgrade-pacemaker-converge.yaml

@@ -1,5 +1,6 @@
 parameter_defaults:
   UpgradeLevelNovaCompute: ''
+  EnableConfigPurge: false
 
 resource_registry:
   OS::TripleO::Services::SaharaApi: ../puppet/services/sahara-api.yaml

environments/major-upgrade-pacemaker-init.yaml

@@ -1,5 +1,6 @@
 parameter_defaults:
   UpgradeLevelNovaCompute: mitaka
+  EnableConfigPurge: true
 
 resource_registry:
   OS::TripleO::Tasks::UpdateWorkflow: ../extraconfig/tasks/major_upgrade_pacemaker_init.yaml

puppet/services/neutron-base.yaml

@@ -44,10 +44,10 @@ parameters:
     description: Set to True to enable debugging on all services.
   EnableConfigPurge:
     type: boolean
-    default: true
+    default: false
     description: >
-        Remove configuration that is not generated by TripleO. Setting
-        to false may result in configuration remnants after updates/upgrades.
+        Remove configuration that is not generated by TripleO. Used to avoid
+        configuration remnants after upgrades.
   NeutronGlobalPhysnetMtu:
     type: number
     default: 1496

puppet/services/nova-base.yaml

@@ -54,10 +54,10 @@ parameters:
     description: Set to True to enable debugging on all services.
   EnableConfigPurge:
     type: boolean
-    default: true
+    default: false
     description: >
-        Remove configuration that is not generated by TripleO. Setting
-        to false may result in configuration remnants after updates/upgrades.
+        Remove configuration that is not generated by TripleO. Used to avoid
+        configuration remnants after upgrades.
   NovaIPv6:
     default: false
     description: Enable IPv6 features in Nova