Fix incorrect handling of list values

Neutron accepts multiple values for availability zone hint, subnet, and
fixed-ip and return lists with multiple elements. At this moment
the corresponding properties in our resource types do not support
array value so we should always pick the first element to fill
the interface mismatch.

Change-Id: I3bcca8b7824be1c56661bef56ed523cc4dfb5d7a
(cherry picked from commit 31862093eb)

lib/puppet/provider/neutron.rb

@@ -24,20 +24,13 @@ class Puppet::Provider::Neutron < Puppet::Provider::Openstack
     fixed_ips.each do |fixed_ip|
       subnet_ids << fixed_ip['subnet_id']
     end
-
-    if subnet_ids.length > 1
-      subnet_ids
-    else
-      subnet_ids.first
-    end
+    # TODO(tkajinam): Support multiple values
+    subnet_ids.first
   end
 
   def self.parse_availability_zone_hint(value)
     hints = JSON.parse(value.gsub(/\\"/,'"').gsub('\'','"'))
-    if hints.length > 1
-      hints
-    else
-      hints.first
-    end
+    # TODO(tkajinam): Support multiple values
+    hints.first
   end
 end

lib/puppet/provider/neutron_port/openstack.rb

@@ -182,11 +182,8 @@ Puppet::Type.type(:neutron_port).provide(
       ips << fixed_ip['ip_address']
     end
 
-    if ips.length > 1
-      ips
-    else
-      ips.first
-    end
+    # TODO(tkajinam): Support multiple values
+    ips.first
   end
 
   def self.parse_binding_profile_interface_name(value)