Allow logrotation actions to be string or array

For prerotate, logrotate, firstaction and lastaction
is very common to need several lines of commands, making
it difficult to pass with a puppet string.
Allow this parameter to be either and string or an array
to allow this usage.

Change-Id: I7451ecc550b50b85c55784ef598f6b45412117fc

templates/config.erb

@@ -2,23 +2,35 @@
 <% @options.each do |opt| -%> <%= opt %>
 <% end -%>
 <% if @prerotate != 'undef' -%>
- prerotate
-  <%= @prerotate %>
- endscript
+  prerotate
+  <%- @prerotate = [@prerotate] unless @prerotate.is_a?(Array) -%>
+  <%- @prerotate.each do |val| -%>
+    <%= val %>
+  <%- end -%>
+  endscript
 <% end -%>
 <% if @postrotate != 'undef' -%>
- postrotate
-  <%= @postrotate %>
- endscript
+  postrotate
+  <%- @postrotate = [@postrotate] unless @postrotate.is_a?(Array) -%>
+  <%- @postrotate.each do |val| -%>
+    <%= val %>
+  <%- end -%>
+  endscript
 <% end -%>
 <% if @firstaction != 'undef' -%>
- firstaction
-  <%= @firstaction %>
- endscript
+  firstaction
+  <%- @firstaction = [@firstaction] unless @firstaction.is_a?(Array) -%>
+  <%- @firstaction.each do |val| -%>
+    <%= val %>
+  <%- end -%>
+  endscript
 <% end -%>
 <% if @lastaction != 'undef' -%>
- lastaction
-  <%= @lastaction %>
- endscript
+  lastaction
+  <%- @lastaction = [@lastaction] unless @lastaction.is_a?(Array) -%>
+  <%- @lastaction.each do |val| -%>
+    <%= val %>
+  <%- end -%>
+  endscript
 <% end -%>
 }