fix(cmapi): MCOL-5962 Fix rollback in mcs cli and passing errors during broadcasting config

* fix(cmapi): ClusterControllerClient request error handling
* fix(cmapi): broadcast_new_config request error handling
* style(cmapi): logs

cmapi/cmapi_server/controllers/api_clients.py

@@ -1,12 +1,14 @@
-import requests
+import logging
 from typing import Any, Dict, Optional, Union
 
 import pyotp
+import requests
 
 from cmapi_server.controllers.dispatcher import _version
 from cmapi_server.constants import (
     CMAPI_CONF_PATH, CURRENT_NODE_CMAPI_URL, SECRET_KEY,
 )
+from cmapi_server.exceptions import CMAPIBasicError
 from cmapi_server.helpers import get_config_parser, get_current_key
 
 
@@ -146,5 +148,28 @@ class ClusterControllerClient:
             response.raise_for_status()
             return response.json()
         # TODO: different handler for timeout exception?
-        except requests.exceptions.RequestException as e:
-            return {'error': str(e)}
+        except requests.HTTPError as exc:
+            resp = exc.response
+            error_msg = str(exc)
+            if resp.status_code == 422:
+                # in this case we think cmapi server returned some value but
+                # had error during running endpoint handler code
+                try:
+                    resp_json = response.json()
+                    error_msg = resp_json.get('error', resp_json)
+                except requests.exceptions.JSONDecodeError:
+                    error_msg = response.text
+            message = (
+                f'API client got an exception in request to {exc.request.url} '
+                f'with code {resp.status_code} and error: {error_msg}'
+            )
+            logging.error(message)
+            raise CMAPIBasicError(message)
+        except requests.exceptions.RequestException as exc:
+            message = (
+                'API client got an undefined error in request to '
+                f'{exc.request.url} with code {exc.response.status_code} and '
+                f'error: {str(exc)}'
+            )
+            logging.error(message)
+            raise CMAPIBasicError(message)