CLI- Task list improvement (#2863)

* cli - task list now returns list of current tasks

* updated changelog

* fixed formatting

CHANGELOG.md

@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- CLI - task list now returns a list of current tasks. (<https://github.com/openvinotoolkit/cvat/pull/2863>)
 - Updated HTTPS install README section (cleanup and described more robust deploy)
 - Logstash is improved for using with configurable elasticsearch outputs (<https://github.com/openvinotoolkit/cvat/pull/2531>)
 - Bumped nuclio version to 1.5.16 (<https://github.com/openvinotoolkit/cvat/pull/2578>)

utils/cli/core/core.py

@@ -43,20 +43,23 @@ def tasks_list(self, use_json_output, **kwargs):
         url = self.api.tasks
         response = self.session.get(url)
         response.raise_for_status()
+        output = []
         page = 1
         while True:
             response_json = response.json()
+            output += response_json['results']
             for r in response_json['results']:
                 if use_json_output:
                     log.info(json.dumps(r, indent=4))
                 else:
                     log.info('{id},{name},{status}'.format(**r))
             if not response_json['next']:
-                return
+                return output
             page += 1
             url = self.api.tasks_page(page)
             response = self.session.get(url)
             response.raise_for_status()
+        return output
 
     def tasks_create(self, name, labels, overlap, segment_size, bug, resource_type, resources,
                      annotation_path='', annotation_format='CVAT XML 1.1',