Add a suffix attribute to the ProgressReport model.

closes #2319
https://pulp.plan.io/issues/2319

app/pulp/app/models/progress.py

@@ -27,6 +27,8 @@ class ProgressReport(Model):
         total: (models.IntegerField) The total count of items to be handled by the ProgressBar
             (required)
         done (models.IntegerField): The count of items already processed. Defaults to 0.
+        suffix (models.TextField): Customizable suffix rendered with the progress report
+            See `docs https://github.com/verigak/progress>`_. for more info.
 
     Relations:
 
@@ -54,6 +56,7 @@ class ProgressReport(Model):
     done = models.IntegerField(default=0)
 
     task = models.ForeignKey("Task", on_delete=models.CASCADE)
+    suffix = models.TextField(default='')
 
     def save(self, *args, **kwargs):
         """

app/pulp/app/serializers/progress.py

@@ -30,6 +30,11 @@ class ProgressReportSerializer(ModelSerializer):
         read_only=True
     )
 
+    suffix = serializers.CharField(
+        help_text=_("The suffix to be shown with the progress report."),
+        read_only=True
+    )
+
     task = serializers.HyperlinkedRelatedField(
         help_text=_("The task associated with this progress report."),
         read_only=True,
@@ -41,4 +46,4 @@ class Meta:
         # this serializer is meant to be nested inside Task serializer,
         # so it will not have its own endpoint, that's why
         # we need to explicitly define fields to exclude '_href' field.
-        fields = ('message', 'state', 'total', 'done', 'task')
+        fields = ('message', 'state', 'total', 'done', 'suffix', 'task')