policy-rc.d: Define default behavior(return code)

... to avoid the warning triggered by logrotate, which was reported in
the bug.

/etc/cron.daily/logrotate:
invoke-rc.d: policy-rc.d query returned "behaviour undefined",
invoke-rc.d: assuming "rotate" is allowed.
invoke-rc.d: policy-rc.d query returned "behaviour undefined",
invoke-rc.d: assuming "rotate" is allowed.

Partial-Bug: #1873030
Change-Id: Icc0c12a6a66d3eb6f655ba1145ba372d5b1d2d43

spec/classes/openstacklib_policyrcd_spec.rb

@@ -37,7 +37,7 @@ then
   exit 101
 fi
 
-
+exit 0
 eof
       }
 
@@ -65,7 +65,7 @@ then
   exit 101
 fi
 
-
+exit 0
 eof
       }
 

templates/policy-rc.d.erb

@@ -5,4 +5,4 @@ then
   exit 101
 fi
 <% end %>
-
+exit 0