gapiutil: retry after all errors

Rather than simply retrying after 503 errors, retry after all error
responses since we have also been seeing some spurious 400 responses
from Google.

gsuitesync/gapiutil.py

@@ -24,13 +24,17 @@ def list_all(list_cb, *, page_size=500, retries=2, retry_delay=5, items_key='ite
         try:
             list_response = list_cb(pageToken=page_token, maxResults=page_size, **kwargs).execute()
         except HttpError as err:
-            if (err.resp.status == 503 and retries > 0):
+            if (err.resp.status >= 400 and retries > 0):
                 retries -= 1
-                LOG.warn('503: Service unavailable - retrying')
+                LOG.warn('Error response: %s %s - retrying', err.resp.status, err.resp.reason)
                 sleep(retry_delay)
                 continue
             if retries == 0:
-                LOG.error('503: Service unavailable - retry count exceeded')
+                LOG.error(
+                    'Error response: %s %s - retry count exceeded', err.resp.status,
+                    err.resp.reason
+                )
+                LOG.error('Error content: %r', err.content)
             raise
         resources.extend(list_response.get(items_key, []))
 
@@ -153,13 +157,17 @@ def get_all_in_list(directory_service, get_cb, *, item_ids=[], id_key='key', bat
             try:
                 batch.execute()
             except HttpError as err:
-                if (err.resp.status == 503 and retries > 0):
+                if (err.resp.status >= 400 and retries > 0):
                     retries -= 1
-                    LOG.warn('503: Service unavailable - retrying')
+                    LOG.warn('Error response: %s %s - retrying', err.resp.status, err.resp.reason)
                     sleep(retry_delay)
                     continue
                 if retries == 0:
-                    LOG.error('503: Service unavailable - retry count exceeded')
+                    LOG.error(
+                        'Error response: %s %s - retry count exceeded', err.resp.status,
+                        err.resp.reason
+                    )
+                    LOG.error('Error content: %r', err.content)
                 raise
             break