Don't be too strict for vlan_ranges

VLAN range can be also in format of physical network or with only
single ID. This patch makes those values pass the validation

For more info please check https://bugzilla.redhat.com/show_bug.cgi?id=1066549

Change-Id: I054fbd45ac2228a3a579c08cdd617d970abcaddf

lib/puppet/parser/functions/validate_network_vlan_ranges.rb

@@ -36,6 +36,9 @@ module Puppet::Parser::Functions
         if ((second_id - first_id) < 0 )
           raise Puppet::Error, "network vlan ranges are invalid."
         end
+      elsif m = /^([^:]+)?(:\d+)?$/.match(range)
+        # Either only name of physical network or single vlan id has
+        # been passed. This is also correct.
       elsif range
         raise Puppet::Error, "network vlan ranges are invalid."
       end