Add tagging to ec2.CopySnapshot (#3365)

The `@freeze_time` decorator was removed because it is not necessary (and was
causing the test to be skipped).

Closes #2940

moto/ec2/responses/elastic_block_store.py

@@ -19,10 +19,13 @@ class ElasticBlockStore(BaseResponse):
         source_snapshot_id = self._get_param("SourceSnapshotId")
         source_region = self._get_param("SourceRegion")
         description = self._get_param("Description")
+        tags = self._parse_tag_specification("TagSpecification")
+        snapshot_tags = tags.get("snapshot", {})
         if self.is_not_dryrun("CopySnapshot"):
             snapshot = self.ec2_backend.copy_snapshot(
                 source_snapshot_id, source_region, description
             )
+            snapshot.add_tags(snapshot_tags)
             template = self.response_template(COPY_SNAPSHOT_RESPONSE)
             return template.render(snapshot=snapshot)
 
@@ -272,6 +275,16 @@ CREATE_SNAPSHOT_RESPONSE = """<CreateSnapshotResponse xmlns="http://ec2.amazonaw
 COPY_SNAPSHOT_RESPONSE = """<CopySnapshotResponse xmlns="http://ec2.amazonaws.com/doc/2016-11-15/">
   <requestId>59dbff89-35bd-4eac-99ed-be587EXAMPLE</requestId>
   <snapshotId>{{ snapshot.id }}</snapshotId>
+  <tagSet>
+    {% for tag in snapshot.get_tags() %}
+      <item>
+      <resourceId>{{ tag.resource_id }}</resourceId>
+      <resourceType>{{ tag.resource_type }}</resourceType>
+      <key>{{ tag.key }}</key>
+      <value>{{ tag.value }}</value>
+      </item>
+    {% endfor %}
+  </tagSet>
 </CopySnapshotResponse>"""
 
 DESCRIBE_SNAPSHOTS_RESPONSE = """<DescribeSnapshotsResponse xmlns="http://ec2.amazonaws.com/doc/2013-10-15/">