[ec2] update snapshot mocks to match recent parser updates

lib/fog/aws/requests/ec2/create_snapshot.rb

@@ -30,17 +30,20 @@ module Fog
 
       class Mock
 
-        def create_snapshot(volume_id)
+        def create_snapshot(volume_id, description = nil)
           response = Excon::Response.new
-          if @data[:volumes][volume_id]
+          if volume = @data[:volumes][volume_id]
             response.status = 200
             snapshot_id = Fog::AWS::Mock.snapshot_id
             data = {
+              'description' => description,
+              'ownerId'     => @owner_id,
               'progress'    => nil,
               'snapshotId'  => snapshot_id,
               'startTime'   => Time.now,
               'status'      => 'pending',
-              'volumeId'    => volume_id
+              'volumeId'    => volume_id,
+              'volumeSize'  => volume['size']
             }
             @data[:snapshots][snapshot_id] = data
             response.body = {

lib/fog/aws/requests/ec2/describe_snapshots.rb

@@ -53,6 +53,9 @@ module Fog
                 elsif Time.now - snapshot['startTime'] > Fog::Mock.delay
                   snapshot['progress']  = '50%'
                   snapshot['status']    = 'in progress'
+                else
+                  snapshot['progress']  = '0%'
+                  snapshot['status']    = 'in progress'
                 end
               end
             end