Increase delay between transaction retries

Since c8771e45b861 the retry is no more a countdown but an increasing count, so
the sleep time must be adapted to also increase over retries.

Closes #13910

trytond/trytond/protocols/dispatcher.py

@@ -201,7 +201,7 @@ def _dispatch(request, pool, *args, **kwargs):
     transaction_extras = {}
     while True:
         if count:
-            time.sleep(0.02 * (retry - count))
+            time.sleep(0.02 * count)
         with Transaction().start(
                 pool.database_name, user,
                 readonly=rpc.readonly, timeout=rpc.timeout,

trytond/trytond/protocols/wrappers.py

@@ -246,7 +246,7 @@ def with_transaction(readonly=None, user=0, context=None, timeout=None):
             transaction_extras = {}
             while True:
                 if count:
-                    time.sleep(0.02 * (retry - count))
+                    time.sleep(0.02 * count)
                 with Transaction().start(
                         pool.database_name, user_, readonly=readonly_,
                         context=context_, timeout=timeout,

trytond/trytond/worker.py

@@ -145,7 +145,7 @@ def run_task(pool, task_id):
         transaction_extras = {}
         while True:
             if count:
-                time.sleep(0.02 * (retry - count))
+                time.sleep(0.02 * count)
             with Transaction().start(
                     pool.database_name, 0,
                     **transaction_extras) as transaction: