Abstract container backend

In the future we want to be able to create bundles that can make
use of different container backends. We leave the current default
set to 'docker' but we allow other types.
Tested with the 'podman' backend after applying:
https://github.com/ClusterLabs/pacemaker/pull/1564
https://github.com/ClusterLabs/pcs/pull/181
https://github.com/ClusterLabs/resource-agents/pull/1193

Change-Id: Ia4a7b58d14d80e85d51e98acec1aad2ba90b69de

lib/puppet/provider/pcmk_bundle/default.rb

@@ -13,9 +13,10 @@ Puppet::Type.type(:pcmk_bundle).provide(:default) do
     storage_maps = @resource[:storage_maps]
     network = @resource[:network]
     location_rule = @resource[:location_rule]
+    container_backend = @resource[:container_backend]
 
     # Build the 'pcs resource create' command.  Check out the pcs man page :-)
-    cmd = 'resource bundle create ' + @resource[:name]+' container docker image=' + @resource[:image]
+    cmd = 'resource bundle create ' + @resource[:name]+' container ' + container_backend + ' image=' + @resource[:image]
     if replicas
       cmd += " replicas=#{replicas}"
     end

lib/puppet/type/pcmk_bundle.rb

@@ -152,4 +152,8 @@ Puppet::Type.newtype(:pcmk_bundle) do
 
     defaultto 600
   end
+  newproperty(:container_backend) do
+    desc "Container backend"
+    defaultto "docker"
+  end
 end

manifests/resource/bundle.pp

@@ -131,6 +131,7 @@ define pacemaker::resource::bundle(
   $try_sleep          = 0,
   $verify_on_create   = false,
   $location_rule      = undef,
+  $container_backend  = 'docker',
   $deep_compare       = hiera('pacemaker::resource::bundle::deep_compare', false),
   $update_settle_secs = hiera('pacemaker::resource::bundle::update_settle_secs', 600),
   ) {
@@ -159,6 +160,7 @@ define pacemaker::resource::bundle(
     try_sleep          => $try_sleep,
     verify_on_create   => $verify_on_create,
     location_rule      => $location_rule,
+    container_backend  => $container_backend,
     deep_compare       => $deep_compare,
     update_settle_secs => $update_settle_secs,
   }