Network ID is only checked if neutron is available

[#128759741](https://www.pivotaltracker.com/story/show/128759741)

Signed-off-by: Beyhan Veli <beyhan.veli@sap.com>

src/bosh_openstack_cpi/lib/cloud/openstack/openstack.rb

@@ -128,19 +128,14 @@ def network
           end
         rescue Excon::Errors::SocketError => e
           cloud_error(socket_error_msg + "#{e.message}")
-        rescue Bosh::Common::RetryCountExceeded, Excon::Errors::ClientError, Excon::Errors::ServerError => e
+        rescue Bosh::Common::RetryCountExceeded, Excon::Errors::ClientError, Excon::Errors::ServerError, Fog::Errors::NotFound => e
           cloud_error("Unable to connect to the OpenStack Network Service API: #{e.message}. Check task debug log for details.")
         end
       end
 
       @network
     end
 
-    def metadata
-
-    end
-
-
     private
 
     def openstack_params(options)

src/bosh_openstack_cpi/spec/unit/openstack_spec.rb

@@ -60,6 +60,17 @@
     end
   end
 
+  context 'when the service is not available' do
+    describe 'Network' do
+      it 'raises a CloudError exception if cannot connect to the service API' do
+        allow(Fog::Network).to receive(:new).and_raise(Fog::Errors::NotFound, 'Not found message')
+        expect {
+          Bosh::OpenStackCloud::Openstack.new(openstack_options).network
+        }.to raise_error(Bosh::Clouds::CloudError,
+                         'Unable to connect to the OpenStack Network Service API: Not found message. Check task debug log for details.')
+      end
+    end
+  end
 
   [ {clazz: Fog::Compute, name: 'Compute', method_name: :compute},
     {clazz: Fog::Image::OpenStack::V2, name: 'Image', method_name: :image},